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Hydrocarbon Spectral Database, Special Units, Fundamental Constants, and Useful Conversion Factors
5. Special Units, Fundamental Constants, and Useful Conversion Factors
5.a. Special Units
| Unit | Definition |
|---|---|
| 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. |
| Å | Angstrom abbreviation for the unit of length in bond distances (1 Å = 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 · Å2, | = 5.053 790 06(51) × 105 MHz · u · Å2 |
| 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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Created April 23, 2018, Updated September 4, 2024