Hydrocarbon Spectral Database

5. Special Units, Fundamental Constants, and Useful Conversion Factors

5.a. Special Units

D  Abbreviation for Debye units (1 D = 10-18 electrostatic units of charge  centimeters, or 1 D = 3.335 64 10-30 coulomb meter).
cm-1       Reciprocal wavelength (wave number) employed as a unit proportional to energy.
Angstrom abbreviation for the unit of length in bond distances (1 = 10-10 m).

5.b. Fundamental Constants and Conversion Factors

  1973 Values used in present tables [23] 1998 Values [24]
A Ia = 5.053 790 5(85) 105 MHz u 2, = 5.053 790 06(51) 105 MHz u 2
h = 6.626 176(36) 10-34 J s, = 6.626 068 76(52) 10-34 J s
c = 2.997 924 58(1) 108 m s-1, = 299 792 458 m s-1
1 cm-1 ≅ 1.986 478(11) 10-23 J,

≅ 11.962 66 J mol-1 ,

≅ 29 979.2458 MHz  ,
≅ 1.986 445 44(16) 10-23 J

≅ 11.962 66 J mol-1 

≅ 29 979.2458 MHz  
1 u = 1.660 565 5(86) 10-27 kg . = 1.660 538 73(13) 10-27 kg .


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