106 TABLE 43 (continued) 



MISCELLANEOUS DERIVED PHYSICAL CONSTANTS 



Energy of one-abs.-volt-electron 



hv/V" = w*e/c = ( i.59io 8 ± 0.0016) X io" 12 ergs 



Speed of abs. -volt-electron (spectroscopic) 



Vc — [2 X io\e/m) sp ] 1 / 2 = (5.93464 ± 0.0017) X io 7 cm • sec.- 1 



Speed of abs.-volt-electron (deflection) 



ve= [2 X 10 s (e/m)dcf «]V 2 — (5. 9481 1 ±0.0034) X io'cmsec.' 1 



Fine structure constant a = 2we 2 /hc = 7.28301 ± 0.006) X icr 3 



Reciprocal of fine structure constant i/a =: 137.29, ± 0.11 



Magnetic moment, Bohr magneton (spectro- 

 scopic) M-i = i h(e/m)s P \ /4ir= (0.9174,0 ± 0.0013) X io _2n erg • gauss" 1 



Magnetic moment, Bohr magneton (deflection) 



fi! = { h(e/m)defi \ /4ir= (0.92163s ± 0.0016) X io" 2n erg • gauss" 1 



Magnetic moment per mole (1 Bohr magneton 

 per molecule) (spectroscopic) puNo = 5563.S7 ± 10 erg • gauss" 1 • mole" 1 



Magnetic moment per mole (1 Bohr magneton 

 per molecule) (deflection) fnN = 5589.14 ± 11 erg • gauss -1 ■ mole" 1 



Zeeman displacement per gauss 



Av'/H = (e/m)sp/4Trc = (4-674ss — 0.003) X io" 5 cm" 1 • gauss" 1 



Band spectrum constant connecting wave-number 



(cm" 1 ) and moment of inertia h/8irc — (27.6533 ± 0.04) X io" 4ft g • cm 



Atomic specific heat constant cil c = h/k = (47757s — 0.0019) X io" 11 sec • deg. 



Reduced mass of H atom. . .fi H = Rh(iiio)sp/R „ = 9.03019 ± 0.010) X io" 28 g 



Schroedinger constant for H atom Sir'/m/Pf = (1.66342 ± 0.003) X io 27 g • erg" 2 • sec." 2 



Schroedinger constant for electron 



8it*(mo)sp/h 2 = (1.66432 ± 0.003) X io 27 g • erg" 2 • sec." 2 



Ionization potential for H atom Rh/vo = 13.5299 ± 0.005 abs. volt 



Ionization potential for He + 4Riie/v = 54.1417 ± 0.020 abs. volt 



Radius of Bohr orbit in normal hydrogen, re- 

 ferred to center of mass, using experimental 



value of i?^ cu,' = a(i — a') 1 / 2 /4wR aa = (0.528109 ± 0.0004) X io" s cm- 

 Speed of electron in normal H orbit, referred to 

 center of mass vo = acRii/R x = (2.182+. ± 0.0017) X io 8 cm • sec." 1 



Smithsonian Tables 



