Precision Determination of the Velocity of Light Derived from a Band Spectrum Method. II
Abstract
The rotational constant B000 for HCN has been measured using the method of exact orders for the 002 infrared rotation vibration absorption band. The value obtained is 1.478235 cm-1. Combined with the microwave measurements by Nethercot and Klein of the same constant in pure frequency units, a value for the velocity of light, c=299789.8+/-3.0 km/sec, is found. The change in the apparent thickness of the Fabry Perot interferometer with wavelength due to the phase shift in the ZnS, MgF2, ZnS coated plates is discussed and the experimental results compared with the calculated values. The rotational constants α3=0.010034 and γ33=0.000183 cm-1 were also obtained with the aid of other interferometric results.
- Publication:
-
Physical Review
- Pub Date:
- May 1954
- DOI:
- 10.1103/PhysRev.94.575
- Bibcode:
- 1954PhRv...94..575R