Table 43 (concluded) 107 



MISCELLANEOUS DERIVED PHYSICAL CONSTANTS 



Hydrogen doublet constant 



Avh =■ Riia/l6 = 0.363659 ± 0.0006 cm" 1 

 Compton shift at 90 (spectroscopic) 



h/moc == (e/m)s P h/e = (0.0241704 ± 0.000016) X io" 8 cm 

 Compton shift at 90 (deflection) 



h/moc — (c/m)defih/e = (0.0242802 ± 0.00003) X io' 8 cm 

 Wave length of i-abs. -volt-electron 



h/[m*(ve)sp] = (12.2100 ±0.006) X I0" 8 cm 



Loschmidt number iu, — No/ v n = (2.70500 ± 0.003) X 10" cm" 3 (o°C, An) 



Wien's displacement constant (indirect) 



A = C2/4.9651 = 0.288361 ± 0.00011 cm • deg. 



First radiation constant * ci = 8whc =(4.932* ± 0.006) X io- 15 erg • cm 



or he 2 = (0.588429 ± 0.0008) X io -5 erg • cm 2 • sec." 1 

 or 2-kUc 1 = (3.69720 ± 0.005) X io" 5 erg ■ cm 2 • sec." 1 

 Energy per mole, equivalent to i-abs. 

 -volt-electron per molecule 



F(abs. coul. • g-equiv." 1 )/ 



/i 5 (abs. joule • cal.15" 1 ) = 23054.8 ± 4cal.i 5 • mole" 1 

 Sackur-Tetrode constant (e = base of 

 log. = 2.71828) 



So = Ro'ln [(2irk) 3 / 2 e 5 / 2 /h :, No 5 / 2 ] = - 1 1 .0533 ± 0.0026 cal.,5 • deg." 1 • mole" 1 

 Chemical constant (unit at. wt., pressure 

 in atm.) 



Jo' = f log [27rk 5 / 3 /Noh 2 ] - log An = - 1. 58825 ± 0.0004 



Multiplier of (Curie constant) 1 / 2 to give 

 magnetic moment in Bohr magnetons 

 per molecule (3k/No)V'/m= 2.83842 ± 0.0019 erg" 1 / 2 ■ gauss • deg." 1 / 3 • mole 1 / 2 



*£ _ Cl \- 5 ( e -c 2 /\T — i)- 1 ; £ may be defined in various ways, and Cx varies accord- 

 ingly. If E x d\ denotes the energy density of unpolarized radiation in range d\ a = Svhc. 

 If E x d\ denotes the intensity of emission of linearly polarized radiation in range d\ 

 perpendicular to a surface, per unit of surface, per unit solid angle, a = he 2 . If E x d\ 

 denotes the emission of unpolarized radiation in range d\ per unit surface, in all directions 

 (27r solid angle), a = 2irhc 2 . 



Smithsonian Tables 



