645 



TABLE 702.— MOBILITY* OF SINGLY-CHARGED GASEOUS IONS AT 

 760 mmHg AND 0°C ** 



(cm/sec per volt/cm) 



Gas (« - l) t K„- K a * 



Air (dry) 000585 2.2 1.6 



A (pure) 00056 206.0 1.81 



CI, .74 .74 



CC1« 0030 .31 .30 



CO 00070 1.14 1.10 



CO, (dry) 00098 .98 .84 



H, 00028 8.15 5.9 



H 2 (pure) 7900.0 13.8 



HC1 0046 .62 .53 



H 2 (at 100°C) .95 1.1 



H 2 S 0040 .56 .62 



He 000074 6.3 5.09 



He (pure) 500.0 21.4 



Hg in He ... 13.4 



Hg in N 2 ... 2.02 



Kr 0007685 ... .94 



N 2 00058 1.84 1.27 



N, (pure) 145.0 2.51 



NH, 0072 .66 .56 



NH 3 inN 2 ... 3.06 



N 2 00113 .90 .82 



Ne 0001231 ... 5.64 



O, 00051 1.8 1.31 



SQ 2 0095 .41 .41 



0.235 (' 

 K= ! 



K = Kopo/p, where pa is the gas density at NTP and p is the density at which K is desired. 



"i / 

 ip/po)U-\) Mo' 



where »n = mass of ion, m 2 = mass of gas particle, « = dielectric constant, (e — l)o is calculated for 

 NTP. Mo = molecular weight of gas. Values of mobility in this table may not be absolute, but are of 

 orienting value. 



** For reference, see footnote 221, p. 644. 



t International Critical Tables; Tables Annuelles Internationales de Constants. 



TABLE 703.— MOLECULAR DIAMETER (BRAGG)* 



From 

 crystal measured 

 Gas in 2d 



Neon 1.30XlO- 8 cm 



Argon 2.05 



Krypton 2.35 



Xenon 2.70 



* For reference, see footnote 220, p. 640. 



TABLE 704.— NUMBER OF MOLECULES (PER cm* AT 0°C) OF MONOLAYER 

 AND EQUIVALENT VOLUME (cm 8 ) * 



Vol gas 

 at 760 mmHg 



No molecules and 20°C 



Gas X 10-" X 10 s 



CO 8.07 3.23 



CO, 5.34 2.13 



CH« 5.23 2.09 



NH, 4.56 1.82 



H 2 5.27 2.11 



* For reference, see footnote 219, p. 636. 

 SMITHSONIAN PHYSICAL TABLES 



