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The Observed Properties of Liquid Helium
at the Saturated Vapor Pressure

Chapter 8. Entropy

Adopted Database for µ+

Author(s)	Key #	Method	Range (K)
Barenghi, et al.	1	Ion Pool	0.2388 T 0.8462
Schwarz	2	Drift Velocity	0.371 T 5.18

Adopted Database for µ-

Author(s)	Key #	Method	Range (K)
Barenghi, et al.	1	Ion Pool	0.0528 T 0.9632
Schwarz	2	Drift Velocity	0.247 T 5.18

Comments and Key to Authors

1) Ref. 18. Uncertainties: for negative ions, > 270mK, and for positive ions, > 370mK, results are in good agreement with Ref. 14. Below these temperatures the mobilities depend on the experimental situation and the paper should be consulted for details.
2) Ref. 14. Uncertainty better than 2%.
3) The splines are fit to the log10 of the mobility.
4) To convert mobilities from m²/V×s to cm²/V×s, multiply by 10⁴.

Table 10.1. Adopted database for the positive ion mobility.

T90 (K)	µ+(m2/V.s)	Key	T90	µ+(m2/V.s)	Key
0.0255	2.11000E+3	1	0.3953	3.80000E+0	2
0.0421	1.73000E+3	1	0.4020	4.97000E+0	1
0.0459	1.38000E+3	1	0.4063	3.36000E+0	2
0.0599	1.32000E+3	1	0.4108	4.01000E+0	1
0.0656	1.22000E+3	1	0.4124	2.95000E+0	2
0.0736	1.05000E+3	1	0.4214	2.63000E+0	2
0.0836	1.10000E+3	1	0.4216	4.18000E+0	1
0.0850	9.13000E+2	1	0.4304	2.38000E+0	2
0.0922	9.45000E+2	1	0.4326	2.86000E+0	1
0.1037	8.46000E+2	1	0.4404	2.05000E+0	2
0.1052	7.75000E+2	1	0.4502	2.17000E+0	1
0.1103	7.70000E+2	1	0.4515	1.75000E+0	2
0.1250	5.96000E+2	1	0.4525	3.51000E+0	1
0.1259	6.51000E+2	1	0.4525	3.61000E+0	1
0.1259	5.71000E+2	1	0.4525	2.83000E+0	1
0.1479	4.21000E+2	1	0.4625	1.46000E+0	2
0.1505	4.10000E+2	1	0.4731	1.68000E+0	1
0.1560	3.95000E+2	1	0.4735	1.23000E+0	2
0.1636	2.85000E+2	1	0.4856	1.01000E+0	2
0.1688	3.06000E+2	1	0.4893	1.15000E+0	1
0.1740	2.14000E+2	1	0.4996	8.05000E-1	2
0.1790	2.07000E+2	1	0.5073	9.81000E-1	1
0.1865	1.56000E+2	1	0.5116	6.42000E-1	2
0.1865	1.82000E-+2	1	0.5253	7.32000E-1	1
0.1889	1.76000E+2	1	0.5277	4.86000E-1	2
0.1988	1.43000E+2	1	0.5310	6.81000E-1	1
0.2059	1.42000E+2	1	0.5417	3.73000E-1	2
0.2181	9.22000E+1	1	0.5470	5.02000E-1	1
0.2227	9.02000E+1	1	0.5501	4.86000E-1	1
0.2390	6.17000E+1	1	0.5568	2.76000E-1	2
0.2454	4.35000E+1	1	0.5679	3.45000E-1	1
0.2627	3.74000E+1	1	0.5718	3.28000E-1	1
0.2687	2.93000E+1	1	0.5748	1.98000E-1	2
0.2816	2.50000E+1	1	0.5883	2.04000E-1	1
0.3012	1.70000E+1	1	0.5917	2.19000E-1	1
0.3039	1.53000E+1	1	0.5918	2.25000E-1	1
0.3063	2.29000E+1	1	0.5918	1.41000E-1	2
0.3313	1.07000E+1	1	0.6115	1.55000E-1	1
0.3318	1.00000E+1	1	0.6117	1.32000E-1	1
0.3522	8.03000E+0	1	0.6119	9.65000E-2	2
0.3569	8.02000E+0	1	0.6121	1.49000E-2	1
0.3702	6.50000E+0	1	0.6218	1.25000E-2	1
0.3703	6.71000E+0	1	0.6330	6.60000E-2	2
0.3722	5.19000E+0	2	0.6340	8.76000E-2	1
0.3793	4.72000E+0	2	0.6371	9.54000E-2	1
0.3873	4.18000E+0	2	0.6440	8.27000E-2	1
0.3917	5.02000E+0	1	0.6508	7.48000E-2	1

Table 10.1. (Continued)

T90 (K)	µ+(m2/V.s)	Key	T90	µ+(m2/V.s)	Key
0.6550	4.45000E-2	2	0.9788	8.09000E+0	1
0.6599	6.24000E-2	1	0.9988	7.15000E-4	2
0.6648	5.83000E-2	1	1.0026	6.44000E-4	1
0.6781	2.97000E-2	2	1.0218	5.60000E-4	1
0.6784	4.59000E-2	1	1.0509	4.80000E-4	2
0.6788	3.96000E-2	1	1.1350	2.57000E-4	2
0.6845	4.23000E-2	1	1.1991	1.66000E-4	2
0.6910	3.22000E-2	1	1.3003	9.16000E-5	2
0.6947	3.50000E-2	1	1.4015	5.48000E-5	2
0.6972	3.36000E-2	1	1.5036	3.53000E-5	2
0.7031	2.03000E-2	2	1.6057	2.44000E-5	2
0.7038	2.97000E-2	1	1.7119	1.80000E-5	2
0.7108	2.70000E-2	1	1.8161	1.39000E-5	2
0.7154	2.18000E-2	1	1.9172	1.09000E-5	2
0.7213	2.25000E-2	1	2.0203	8.42000E-6	2
0.7292	1.38000E-2	2	2.1215	6.22000E-6	2
0.7318	1.65000E-2	1	2.1365	5.86000E-6	2
0.7330	1.93000E-2	1	2.1516	5.55000E-6	2
0.7402	1.69000E-2	1	2.1676	5.17000E-6	2
0.7474	1.54000E-2	1	2.1738	5.04000E-6	2
0.7505	1.25000E-2	1	2.1788	4.96000E-6	2
0.7591	1.31000E-2	1	2.2046	4.72000E-6	2
0.7593	8.86000E-3	2	2.2647	4.52000E-6	2
0.7633	1.22000E-2	1	2.3749	4.30000E-6	2
0.7637	1.19000E-2	1	2.4951	4.20000E-6	2
0.7715	9.20000E-3	1	2.6455	4.13000E-6	2
0.7731	1.07000E-2	1	2.8260	4.12000E-6	2
0.7833	8.98000E-3	1	3.0263	4.16000E-6	2
0.7877	8.52000E=3	1	3.2567	4.23000E-6	2
0.7883	6.05000E-3	2	3.5070	4.35000E-2	2
0.7928	6.78000E-3	1	3.7771	4.49000E-2	2
0.8070	6.44000E-3	1	3.9370	4.60000E-2	2
0.8107	5.29000E-3	1	4.1671	4.70000E-2	2
0.8224	4.01000E-3	2	4.3370	4.80000E-2	2
0.8324	3.93000E-3	1	4.4570	4.87000E-2	2
0.8543	2.98000E-3	1	4.5571	4.98000E-2	2
0.8615	2.58000E-3	2	4.7073	4.97000E-2	2
0.8761	2.39000E-3	1	4.8473	4.92000E-6	2
0.8821	2.20000E-3	1	4.9673	4.89000E-6	2
0.8914	1.96000E-3	1	5.0172	4.83000E-6	2
0.8996	1.74000E-3	2	5.0571	4.73000E-6	2
0.9131	1.55000E-3	1	5.0871	4.62000E-6	2
0.9344	1.24000E-3	1	5.1270	4.47000E-6	2
0.9477	1.11000E-3	2	5.1669	4.01000E-6	2
0.9541	1.04000E-3	1	5.1868	3.76000E-6	2

Figure 10.1. Positive ion mobility as a function of temperature along the saturated vapor pressure line.

Table 10.2. Knots and coefficients for the spline fit of .

Knots	Coefficients
K(1) = 2.549509E-2	C(1) = 7.324336E-4
K(2) = 2.549509E-2	C(2) = 7.127592E-4
K(3) = 2.549509E-2	C(3) = 6.936548E-4
K(4) = 2.549509E-2	C(4) = 5.173557E-4
K(5) = 8.989802E-2	C(5) = 4.285367E-4
K(6) = 2.949869E-1	C(6) = 2.823892E-4
K(7) = 4.513886E-1	C(7) = 2.125491E-4
K(8) = 7.045304E-1	C(8) = 1.285926E-4
K(9) = 7.577476E-1	C(9) = 5.123347E-5
K(10) = 7.944735E-1	C(10) = -3.728677E-5
K(11) = 1.062780E+0	C(11) = -8.564176E-5
K(12) = 1.394506E+0	C(12) = -1.067754E-4
K(13) = 1.791246E+0	C(13) = -1.321435E-4
K(14) = 2.152366E+0	C(14) = -1.381473E-4
K(15) = 2.203504E+0	C(15) = -1.396425E-4
K(16) = 2.205589E+0	C(16) = -1.325568E-4
K(17) = 2.727358E+0	C(17) = -1.292173E-4
K(18) = 4.425492E+0	C(18) = -1.335656E-4
K(19) = 5.043800E+0	C(19) = -1.409701E-4
K(20) = 5.154401E+0	C(20) = -1.424813E-4
K(21) = 5.186798E+0
K(22) = 5.186798E+0
K(23) = 5.186798E+0
K(24) = 5.186798E+0

Figure 10.2. Deviation of the database from the spline fit to .

Note : The large deviations at low temperatures reflect a divergence in magnitudes reported in Refs. 14 and 18.

Table 10.3. Adopted database for the negative ion mobility.

T90 (K)	µ-(m2/V.s)	Key	T90	µ-(m2/V.s)	Key
0.0351	1.08000E+3	1	0.0884	8.79000E+0	1
0.0405	6.47000E+2	1	0.0884	8.89000E+0	1
0.0449	3.76000E+2	1	0.0903	7.10000E+0	1
0.0496	2.49000E+2	1	0.0915	7.49000E+0	1
0.0531	1.69000E+2	1	0.0921	7.30000E+0	1
0.0541	1.34000E+2	1	0.0942	6.59000E+0	1
0.0541	1.46000E+2	1	0.0946	5.74000E+0	1
0.0547	1.41000E+2	1	0.0986	5.44000E+0	1
0.0547	1.29000E+2	1	0.0987	4.68000E+0	1
0.0555	1.18000E+2	1	0.0998	4.91000E+0	1
0.0560	1.16000E+2	1	0.1002	5.70000E+0	1
0.0575	9.48000E+1	1	0.1014	5.00000E+0	1
0.0578	8.71000E+1	1	0.1015	4.51000E+0	1
0.0596	7.91000E+1	1	0.1019	4.81000E+0	1
0.0596	7.72000E+1	1	0.1019	4.76000E+0	1
0.0596	8.11000E+1	1	0.1019	4.79000E+0	1
0.0597	7.72000E+1	1	0.1036	4.72000E+0	1
0.0597	7.80000E+1	1	0.1044	4.33000E+0	1
0.0597	7.83000E+1	1	0.1048	3.75000E+0	1
0.0601	7.41000E+1	1	0.1048	3.98000E+0	1
0.0601	7.02000E+1	1	0.1064	3.42000E+0	1
0.0601	7.18000E+1	1	0.1083	3.41000E+0	1
0.0601	6.87000E+1	1	0.1084	3.72000E+0	1
0.0616	6.01000E+1	1	0.1102	3.49000E+0	1
0.0621	6.22000E+1	1	0.1125	3.26000E+0	1
0.0622	5.99000E+1	1	0.1125	3.22000E+0	1
0.0632	5.59000E+1	1	0.1142	2.69000E+0	1
0.0644	4.76000E+1	1	0.1151	2.67000E+0	1
0.0655	4.55000E+1	1	0.1164	2.87000E+0	1
0.0657	3.37000E+1	1	0.1196	2.31000E+0	1
0.0663	4.15000E+1	1	0.1206	2.62000E+0	1
0.0663	4.03000E+1	1	0.1207	2.55000E+0	1
0.0685	3.39000E+1	1	0.1209	2.14000E+0	1
0.0686	3.63000E+1	1	0.1247	1.96000E+0	1
0.0688	3.39000E+1	1	0.1295	1.62000E+0	1
0.0690	3.27000E+1	1	0.1323	1.59000E+0	1
0.0690	3.39000E+1	1	0.1387	1.25000E+0	1
0.0698	3.11000E+1	1	0.1395	1.29000E+0	1
0.0704	2.91000E+1	1	0.1411	1.20000E+0	1
0.0704	2.92000E+1	1	0.1451	1.09000E+0	1
0.0704	2.85000E+1	1	0.1464	1.09000E+0	1
0.0745	2.09000E+1	1	0.1503	9.61000E-1	1
0.0782	1.66000E+1	1	0.1510	9.78000E-1	1
0.0782	1.62000E+1	1	0.1583	8.07000E-1	1
0.0820	1.26000E+1	1	0.1600	8.06000E-1	1
0.0843	1.11000E+1	1	0.1644	7.10000E-1	1
0.0873	9.75000E+0	1	0.1673	6.93000E-1	1

Table 10.3. (Continued)

T90 (K)	µ-(m2/V.s)	Key	T90	µ-(m2/V.s)	Key
0.1718	6.14000E-1	1	0.2914	1.20000E-1	1
0.1730	6.19000E-1	1	0.2920	1.12000E-1	2
0.1776	5.48000E-1	1	0.2937	1.21000E-1	1
0.1796	5.44000E-1	1	0.2965	1.18000E-1	1
0.1821	5.08000E-1	1	0.2972	1.13000E-1	1
0.1860	4.92000E-1	1	0.2990	1.15000E-1	1
0.1861	4.75000E-1	1	0.3010	1.02000E-1	2
0.1919	4.30000E-1	1	0.3017	1.09000E-1	1
0.1920	4.44000E-1	1	0.3029	9.99000E-2	1
0.1957	4.04000E-1	1	0.3072	1.03000E-1	1
0.1976	4.04000E-1	1	0.3076	1.06000E-1	1
0.2022	3.76000E-1	1	0.3111	9.25000E-2	2
0.2036	3.57000E-1	1	0.3118	1.02000E-1	1
0.2078	3.34000E-1	1	0.3132	9.73000E-2	1
0.2096	3.36000E-1	1	0.3182	9.62000E-2	1
0.2152	3.09000E-1	1	0.3202	9.14000E-2	1
0.2161	2.97000E-1	1	0.3211	8.35000E-2	2
0.2189	2.94000E-1	1	0.3231	9.22000E-2	1
0.2222	2.71000E-1	1	0.3248	8.78000E-2	1
0.2262	2.65000E-1	1	0.3292	8.47000E-2	1
0.2270	2.54000E-1	1	0.3308	8.60000E-2	1
0.2330	2.42000E-1	1	0.3331	7.50000E-2	2
0.2334	2.34000E-1	1	0.3362	7.96000E-2	1
0.2375	2.22000E-1	1	0.3377	6.60000E-2	1
0.2382	2.26000E-1	1	0.3411	6.42000E-2	1
0.2402	2.14000E-1	1	0.3424	7.82000E-2	1
0.2438	2.12000E-1	1	0.3425	7.55000E-2	1
0.2465	1.98000E-1	1	0.3446	6.26000E-2	1
0.2507	1.88000E-1	1	0.3452	6.70000E-2	2
0.2512	1.93000E-1	1	0.3463	7.32000E-2	1
0.2571	1.80000E-1	1	0.3483	7.44000E-2	1
0.2575	1.74000E-1	1	0.3494	6.00000E-2	1
0.2628	1.63000E-1	1	0.3503	7.10000E-2	1
0.2631	1.68000E-1	1	0.3529	7.16000E-2	1
0.2675	1.55000E-1	1	0.3560	5.69000E-2	1
0.2703	1.55000E-1	1	0.3582	6.05000E-2	2
0.2732	1.45000E-1	1	0.3589	6.83000E-2	1
0.2749	1.35000E-1	2	0.3634	6.60000E-2	1
0.2757	1.46000E-1	1	0.3640	5.33000E-2	1
0.2774	1.43000E-1	1	0.3711	5.05000E-2	1
0.2782	1.38000E-1	1	0.3722	5.40000E-2	2
0.2811	1.33000E-1	1	0.3741	6.11000E-2	1
0.2812	1.37000E-1	1	0.3762	.86000E-2	1
0.2840	1.23000E-1	2	0.3808	5.79000E-2	1
0.2879	1.24000E-1	1	0.3857	4.53000E-2	1
0.2896	1.26000E-1	1	0.3873	5.56000E-2	1
0.2898	1.26000E-1	1	0.3873	4.80000E-2	2

Table 10.3. (Continued)

T90 (K)	µ-(m2/V.s)	Key	T90	µ-(m2/V.s)	Key
0.3907	4.37000E-2	1	0.5219	1.86000E-2	1
0.3933	5.27000E-2	1	0.5238	2.32000E-2	1
0.3960	4.20000E-2	1	0.5257	1.82000E-2	1
0.3999	5.32000E-2	1	0.5277	1.90000E-2	2
0.4015	4.04000E-2	1	0.5322	2.20000E-2	1
0.4063	4.23000E-2	2	0.5335	1.73000E-2	1
0.4065	4.82000E-2	1	0.5400	2.10000E-2	1
0.4087	3.84000E-2	1	0.5400	1.72000E-2	1
0.4133	4.61000E-2	1	0.5400	1.67000E-2	1
0.4178	3.60000E-2	1	0.5417	1.74000E-2	2
0.4187	4.43000E-2	1	0.5479	1.59000E-2	1
0.4214	3.72000E-2	2	0.5539	1.93000E-2	1
0.4244	4.27000E-2	1	0.5539	1.72000E-2	1
0.4263	3.40000E-2	1	0.5568	1.56000E-2	2
0.4320	4.05000E-2	1	0.5587	1.49000E-2	1
0.4321	3.28000E-2	1	0.5635	1.45000E-2	1
0.4380	3.90000E-2	1	0.5655	1.81000E-2	1
0.4381	3.13000E-2	1	0.5655	1.72000E-2	1
0.4404	3.27000E-2	2	0.5710	1.38000E-2	1
0.4465	3.70000E-2	1	0.5726	1.72000E-2	1
0.4468	2.97000E-2	1	0.5748	1.41000E-2	2
0.4533	3.54000E-2	1	0.5789	1.31000E-2	1
0.4542	2.83000E-2	1	0.5820	1.64000E-2	1
0.4598	3.95000E-2		0.5836	1.27000E-2	1
0.4617	2.69000E-2	1	0.5912	1.21000E-2	1
0.4625	2.84000E-2	2	0.5918	1.25000E-2	2
0.4653	3.29000E-2	1	0.5936	1.51000E-2	1
0.4694	2.57000E-2	1	0.6048	11000E-2	1
0.4714	3.17000E-2	1	0.6052	1.40000E-2	1
0.4717	2.44000E-2	1	0.6052	1.64000E-2	1
0.4794	3.01000E-2	1	0.6102	1.34000E-2	1
0.4805	2.39000E-2	1	0.6102	1.07000E-2	1
0.4845	2.95000E-2	1	0.6119	1.09000E-2	2
0.4856	2.45000E-2	2	0.6152	1.31000E-2	1
0.4908	2.81000E-2	1	0.6189	1.01000E-2	1
0.4921	2.23000E-2	1	0.6242	9.69000E-3	1
0.4951	2.19000E-2	1	0.6278	1.20000E-2	1
0.4986	2.68000E-2	1	0.6278	1.31000E-2	1
0.4996	2.25000E-2	2	0.6330	9.29000E-3	2
0.5016	2.64000E-2	1	0.6340	9.10000E-3	1
0.5062	2.57000E-2	1	0.6347	1.14000E-2	1
0.5070	2.03000E-2	1	0.6416	8.76000E-3	1
0.5111	1.99000E-2	1	0.6419	1.08000E-2	1
0.5116	2.09000E-2	2	0.6464	1.04000E-2	1
0.5126	2.47000E-2	1	0.6468	8.87000E-3	1
0.5126	2.20000E-2	1	0.6529	8.45000E-3	1
0.5162	2.06000E-2	1	0.6532	7.85000E-3	1

Table 10.3. (Continued)

T90 (K)	µ-(m2/V.s)	Key	T90	µ-(m2/V.s)	Key
0.6543	9.79000E-3	1	0.8132	1.90000E-3	1
0.6550	7.86000E-3	2	0.8224	1.71000E-3	2
0.6588	7.30000E-3	1	0.8229	1.74000E-3	1
0.6595	7.98000E-3	1	0.8357	1.51000E-3	1
0.6637	7.69000E-3	1	0.8417	1.44000E-3	1
0.6644	9.01000E-3	1	0.8421	1.37000E-3	1
0.6662	7.07000E-3	1	0.8450	1.32000E-3	1
0.6712	7.23000E-3	1	0.8526	1.22000E-3	1
0.6763	6.50000E-3	1	0.8606	1.66000E-3	1
0.6766	6.93000E-3	1	0.8615	1.19000E-3	2
0.6781	6.50000E-3	2	0.8713	1.00000E-3	1
0.6824	6.18000E-3	1	0.8834	8.83000E-4	1
0.6831	6.55000E-3	1	0.8996	8.40000E-4	2
0.6889	5.86000E-3	1	0.9144	6.28000E-4	1
0.6932	5.99000E-3	1	0.9257	5.74000E-4	1
0.6958	5.54000E-3	1	0.9321	5.50000E-4	1
0.7023	5.73000E-3	1	0.9394	7.53000E-4	1
0.7031	5.25000E-3	2	0.9412	5.03000E-4	1
0.7038	5.14000E-3	1	0.9453	4.95000E-4	1
0.7108	5.17000E-3	1	0.9477	5.63000E-4	2
0.7116	5.28000E-3	1	0.9578	4.32000E-4	1
0.7123	5.06000E-3	1	0.9578	4.40000E-4	1
0.7135	4.70000E-3	1	0.9689	4.08000E-4	1
0.7165	4.90000E-3	1	0.9736	3.77000E-4	1
0.7206	4.68000E-3	1	0.9945	3.14000E-4	1
0.7217	4.36000E-3	1	0.9988	3.77000E-4	2
0.7262	4.43000E-3	1	1.0098	2.75000E-4	1
0.7292	4.11000E-3	2	1.0098	2.90000E-4	1
0.7296	4.06000E-3	1	1.0198	2.75000E-4	1
0.7364	4.04000E-3	1	1.0308	2.35000E-4	1
0.7368	3.96000E-3	1	1.0358	2.35000E-4	1
0.7440	3.75000E-3	1	.0509	2.04000E-4	1
0.7455	3.51000E-3	1	1.0509	2.04000E-4	1
0.7505	3.53000E-3	1	1.0509	2.60000E-4	2
0.7532	3.23000E-3	1	1.1350	2.51000E-4	2
0.7564	3.15000E-3	1	1.1991	1.00000E-5	2
0.7593	3.09000E-3	2	1.3003	5.76000E-5	2
0.7676	2.99000E-3	1	1.4015	3.60000E-5	2
0.7743	2.78000E-3	1	1.5036	2.42000E-5	2
0.7774	2.67000E-3	1	1.6057	1.74000E-5	2
0.7802	2.56000E-3	1	1.7119	1.33000E-5	2
0.7841	2.46000E-3	1	1.8161	1.05000E-5	2
0.7881	2.35000E-3	1	1.9172	8.42000E-6	2
0.7883	2.35000E-3	2	2.0203	6.47000E-6	2
0.7964	2.18000E-3	1	2.1215	4.61000E-6	2
0.7964	2.24000E-3	1	2.1365	4.37000E-6	2
0.8054	2.06000E-3	1	2.1516	4.05000E-6	2
2.1676	3.68000E-6	2	4.1671	4.96000E-6	2
2.1738	3.56000E-6	2	4.3370	1.91000E-6	2
2.1788	3.46000E-6	2	4.4570	1.87000E-6	2
2.2046	3.26000E-6	2	4.5571	1.86000E-6	2
2.2647	3.01000E-6	2	4.7073	1.80000E-6	2
2.3749	2.78000E-2	2	4.8473	1.76000E-6	2
2.4951	2.61000E-6	2	4.9673	1.72000E-6	2
2.6455	2.47000E-6	2	5.0172	1.69000E-6	2
2.8260	2.34000E-6	2	5.0571	1.67000E-6	2
3.0263	2.26000E-6	2	5.0871	1.65000E-6	2
3.2567	2.18000E-6	2	5.1270	1.61000E-6	2
3.5070	2.11000E-6	2	5.1669	1.58000E-6	2
3.7771	2.03000E-6	2	5.1868	1.57000E-6	2
3.9370	2.01000E-6	2

Figure 10.3. The recommended values of the negative ion mobility as a function of temperature at saturated vapor pressure.

Table 10.4. Knots and coefficients for the spline fit of . .

Knots	Coefficients
K(1) = 3.513060E-2	C(1) = 7.033374E-4
K(2) = 3.513060E-2	C(2) = 6.736553E-4
K(3) = 3.513060E-2	C(3) = 5.158198E-4
K(4) = 3.513060E-2	C(4) = 4.508211E-4
K(5) = 5.875667E-2	C(5) = 4.002894E-4
K(6) = 1.179363E-1	C(6) = 2.552750E-4
K(7) = 1.537502E-1	C(7) = 2.496965E-4
K(8) = 1.649872E-1	C(8) = 1.466750E-4
K(9) = 6.623561E-1	C(9) = 1.088565E-4
K(10) = 8.008330E-1	C(10) = 4.892824E-5
K(11) = 8.281207E-1	C(11) = 1.064366E-5
K(12) = 9.599097E-1	C(12) = -4.138096E-5
K(13) = 1.152959E+0	C(13) = -8.747069E-5
K(14) = 1.351840E+0	C(14) = -1.058640E-4
K(15) = 1.607292E+0	C(15) = -1.326369E-4
K(16) = 2.021290E+0	C(16) = -1.474489E-4
K(17) = 2.176597E+0	C(17) = -1.522085E-4
K(18) = 2.186372E+0	C(18) = -1.603564E-4
K(19) = 2.189764E+0	C(19) = -1.681873E-4
K(20) = 2.374662E+0	C(20) = -1.700160E-4
K(21) = 3.014612E+0	C(21) = -1.756753E-4
K(22) = 4.660651E+0	C(22) = -1.768276E-4
K(23) = 4.838042E+0	C(23) = -1.801619E-4
K(24) = 5.105466E+0	C(24) = -1.804100E-4
K(25) = 5.186798E+0
K(26) = 5.186798E+0
K(27) = 5.186798E+0
K(28) = 5.186798E+0

Figure 10.4. The fractional deviation of values of the adopted database from the recommended values for the in liquid 4He expressed in percent.

Table 10.5. Recommended values of the positive ion mobility in liquid 4He.

T90 (K)	µ+(m2/V.s)	T90 (K)	µ+(m2/V.s)
0.1000	8.577E+2	2.1765	5.017E-6
0.1500	3.902E+2	2.1766	5.015E-6
0.2000	1.403E+2	2.1767	5.013E-6
0.2500	4.723E+1	2.1768	5.012E-6
0.3000	1.765E+1	2.1769	5.010E-6
0.3500	8.127E+0	2.1770	5.008E-6
0.4000	4.202E+0	2.2000	4.733E-6
0.4500	2.146E+0	2.2500	4.571E-6
0.5000	9.786E-1	2.3000	4.447E-6
0.5500	4.069E-1	2.3500	4.349E-6
0.6000	1.627E-1	2.4000	4.274E-6
0.6500	6.605E-2	2.4500	4.218E-6
0.7000	2.870E-2	2.5000	4.178E-6
0.7500	1.359E-2	2.5500	4.151E-6
0.8000	6.271E-3	2.6000	4.135E-6
0.8500	3.148E-3	2.6500	4.127E-6
0.9000	1.756E-3	2.7000	4.124E-6
0.9500	1.066E-3	2.7500	4.125E-6
1.0000	6.906E-4	2.8000	4.128E-6
1.0500	4.676E-4	2.8500	4.133E-6
1.1000	3.247E-4	2.9000	4.140E-6
1.1500	2.299E-4	2.9500	4.148E-6
1.2000	1.659E-4	3.0000	4.158E-6
1.2500	1.221E-4	3.0500	4.170E-6
1.3000	9.174E-5	3.1000	4.184E-6
1.3500	7.033E-5	3.1500	4.198E-6
1.4000	5.505E-5	3.2000	4.215E-6
1.4500	4.398E-5	3.2500	4.233E-6
1.5000	3.583E-5	3.3000	4.252E-6
1.5500	2.971E-5	3.3500	4.272E-6
1.6000	2.503E-5	3.4000	4.293E-6
1.6500	2.139E-5	3.4500	4.316E-6
1.7000	1.852E-5	3.5000	4.339E-6
1.7500	1.622E-5	3.5500	4.364E-6
1.8000	1.434E-5	3.6000	4.389E-6
1.8500	1.277E-5	3.6500	4.416E-6
1.9000	1.140E-5	3.7000	4.443E-6
1.9500	1.014E-5	3.7500	4.470E-6
2.0000	8.945E-6	3.8000	4.499E-6
2.0500	7.787E-6	3.8500	4.528E-6
2.1000	6.653E-6	3.9000	4.557E-6
2.1500	5.550E-6	3.9500	4.586E-6
2.1760	5.025E-6	4.0000	4.616E-6
2.1761	5.024E-6	4.0500	4.646E-6
2.1762	5.022E-6	4.1000	4.677E-6
2.1763	5.020E-6	4.1500	4.707E-6
2.1764	5.019E-6	4.2000	4.737E-6
4.2500	4.767E-6	4.6500	4.969E-6
4.3000	4.797E-6	4.7000	4.978E-6
4.3500	4.826E-6	4.7500	4.979E-6
4.4000	4.855E-6	4.8000	4.970E-6
4.4500	4.883E-6	4.8500	4.951E-6
4.5000	4.910E-6	4.9000	4.921E-6
4.5500	4.934E-6	4.9500	4.878E-6
4.6000	4.954E-6	5.0000	4.822E-6

Table 10.6. Recommended values of the negative ion mobility of liquid ⁴He.

T90 (K)	µ-(m2/V.s)	T90 (K)	µ-(m2/V.s)
0.1000	5.012E+0	2.1765	3.513E-6
0.1500	9.560E-1	2.1766	3.511E-6
0.2000	3.913E-1	2.1767	3.509E-6
0.2500	1.924E-1	2.1768	3.507E-6
0.3000	1.079E-1	2.1769	3.505E-6
0.3500	6.729E-2	2.1770	3.503E-6
0.4000	4.546E-2	2.2000	3.269E-6
0.4500	3.244E-2	2.2500	3.062E-6
0.5000	2.383E-2	2.3000	2.921E-6
0.5500	1.757E-2	2.2500	3.062E-6
0.6000	1.267E-2	2.3000	2.921E-6
0.6500	8.707E-3	2.3500	2.821E-6
0.7000	5.592E-3	2.4000	2.740E-6
0.7500	3.444E-3	2.4500	2.670E-6
0.8000	2.138E-3	2.5000	2.607E-6
0.8500	1.342E-3	2.5500	2.552E-6
0.9000	8.006E-4	2.6000	2.504E-6
0.9500	4.844E-4	2.6500	2.461E-6
1.0000	3.173E-4	2.7000	2.423E-6
1.0500	2.253E-4	2.7500	2.390E-6
1.1000	1.685E-4	2.8000	2.360E-6
1.1500	1.290E-4	2.8500	2.334E-6
1.2000	9.880E-5	2.9000	2.309E-6
1.2500	7.567E-5	2.9500	2.287E-6
1.3000	5.836E-5	3.0000	2.267E-6
1.3500	4.562E-5	3.0500	2.248E-6
1.4000	3.636E-5	3.1000	2.229E-6
1.4500	2.956E-5	3.1500	2.212E-6
1.5000	2.449E-5	3.2000	2.195E-6
1.5500	2.066E-5	3.2500	2.180E-6
1.6000	1.772E-5	3.3000	2.164E-6
1.6500	1.545E-5	3.3500	2.150E-6
1.7000	1.363E-5	3.4000	2.136E-6
1.7500	1.214E-5	3.4500	2.122E-6
1.8000	1.088E-5	3.5000	2.109E-6
1.8500	9.757E-6	3.5500	2.097E-6
1.9000	8.736E-6	3.6000	2.084E-6
1.9500	7.779E-6	3.6500	2.072E-6
2.0000	6.862E-6	3.7000	2.060E-6
2.0500	5.971E-6	3.7500	2.049E-6
2.1000	5.052E-6	3.8000	2.037E-6
2.1500	4.060E-6	3.8500	2.026E-6
2.1760	3.523E-6	3.9000	2.015E-6
2.1761	3.521E-6	3.9500	2.003E-6
2.1762	3.519E-6	4.0000	1.992E-6
2.1763	3.517E-6	4.0500	1.980E-6
2.1764	3.515E-6	4.1000	1.969E-6
4.1500	1.957E-6	4.6000	1.837E-6
4.2000	1.945E-6	4.6500	1.822E-6
4.2500	1.933E-6	4.7000	1.806E-6
4.3000	1.920E-6	4.7500	1.790E-6
4.3500	1.907E-6	4.8000	1.774E-6
4.4000	1.894E-6	4.8500	1.759E-6
4.4500	1.881E-6	4.9000	1.743E-6
4.5000	1.867E-6	4.9500	1.726E-6
4.5500	1.852E-6	5.0000	1.703E-6

Chronological Bibliography for Ion Mobilities

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