54 



TABLE 28.— GENERAL PHYSICAL CONSTANTS ACCORDING TO BEARDEN 



AND ASSOCIATES* 



Part 1 1 (atomic weights according to the physical scale unless otherwise indicated) 



Least-squares adjusted values of 



Atomic mass of hydrogen H = 



Atomic mass of deuterium D = 



Atomic mass of deuteron d = 



Atomic mass of proton M = 



Atomic mass of electron Nm = 



Electron mass tn = 



Reduced electron mass in hydrogen atom 



M = 



Ratio proton mass to electron mass 



M/mN = 

 Ratio of Siegbahn X-unit to miiliangstrom 



X f /X. = 

 Ratio of physical to chemical scales of 



atomic weights r = 



Faraday F = 



Electron charge e = 



Specific electronic charge e/m = 



Planck's constant h = 



Planck's constant X 1/2 * % = 



hie — 

 h/nt = 



Avogadro's number N = 



Boltzmann's constant k = 



Loschmidt's number n = 



Rydberg for infinite mass R a = 



Rydberg for hydrogen Rh = 



Rydberg for deuterium Rd =■ 



Gas constant per mole Ro = 



Molar volume Vo-= 



Fine structure constant o r= 



l/o = 



Velocity of light c = 



First radiation constant d = 



Second radiation constant Ct = 



Stefan-Boltzmann constant a = 



Wien displacement law constant. . .X max T = 



Bohr magneton Mo = 



Theoretical magnetic moment of electron 



First Bohr radius a c = 



Conversion factor for atomic mass units 



to Mev Eo = 



Conversion factor for grams to Mev. ..£<,= 



Wavelength associated with 1 ev X = 



Wave number associated with 1 ev v = 



the fundamental atomic constants 

 1.008142 ±.000003) 

 2.014735 ± .000006) 

 2.014186 ± .000006) 

 1.007593 ± .000003) 

 5.48756 ± .00018) X 10" 4 

 9. 108 18 ±.00079) X 10"" g 



9.10322 ± .00072) X 10"" g 



1836.139 ± .054) 



1.002058 ±.000039) 



1.0002783 ± .0000005) 



9652.14 ± .33) emu (g-equiv)" 1 



4.80283 ± .00022) X lO" 10 esu 



5.27309 ± .00024) X 10" esu g" 1 



6.62509 ± .00059) X 10" 27 erg sec 



1.05442 ± .00009) X lO^erg sec 



1.37941 ± .00006) X 10" 17 erg sec (esu)" 1 



7.27377 ±.0001 7) cm 2 sec" 1 



6.02487 ± .00045) X 10 23 molecules (g-mol)" 



1.38039 ± .00010) X 10" ia erg deg" 1 



2.68719 ± .00020) X 10 19 molecules cm" 3 



109737.311 ±.012) cm" 1 



109677.578 ± .012) cm' 1 



109707.419 ± .012) cm" 1 



8.31665 ± .00034) X 10 7 erg mol" 1 deg" 1 



2.24207 ± .00004) X 10 4 cm 8 mol" 1 



7.29729 ± .00008) X 10" 3 



137.0371 ± .0016) 



2.997925 ± .000008) X 10 lo cm sec" 1 



4.99175 ± .00044) X 10- 1B ergcm 



1.43884 ±.00004 cm deg 



5.66858 ± .00053) X 10" B erg cm" 2 deg" 4 sec" 



.289789 ± .000009) cm deg 



.927313 ± .000055) X 10' 20 erg gauss" 1 



.928375 ± .000055) X lO" 20 erg gauss" 1 

 5.29173 ± .00006) X 10- 9 cm 



9.31145 ± .0032) X 10 2 Mev (amu)" 1 

 5.61003 ± .00026) X 10 28 Mev g" 1 

 1.23976 ± .00005) X 10" 4 cm 

 8.05611 ± .00035) X 10 3 cm- 1 ev- 1 



* For reference, see footnote 18a, p. 46. 



t Private communication by J. A. Bearden. Data presented at May 1953 meeting of Physical Society 

 at Washington by Bearden, Earle, Minkowski, Thomsen, Johns Hopkins University. 



Part 2t 



Multiplier of (Curie constant) 172 t o give 

 magnetic moment per molecule. V 3k/ N— (2.62173 ± .00009) X 10" 21 (erg mol deg" 1 ) * 



Atomic specific heat constant h/k = (4.79903 ± .00023) X 10" 11 sec deg 



Schrodinger constant for fixed nucleus.. 



2m/h 2 = (1.638995 ± .000045) X 10 27 erg" 1 cm" 2 



Schrodinger constant for H] atom. .2fi/h 2 = (1.638103 ± .000045) X 10 27 erg" 1 cm" 2 



Energy associated with unit wave num- 

 ber £, = (1.985698 ± .000048) X 10" 16 erg 



Speed of 1 ev electron v = (5.931098 ± .000046) X 10 7 cm sec" 1 



(continued) 



t For reference, see footnote 18a, p. 46. 

 SMITHSONIAN PHYSICAL TABLES 



