Absolute frequencies of lasing transitions in seven CO2isotopic species

Author

Freed, Charles ; Bradley, Lee C. ; O´Donnell, R.G.

Author_Institution

M.I.T. Lincoln Lab., Lexington, MA, USA

Volume

16

Issue

11

fYear

1980

fDate

11/1/1980 12:00:00 AM

Firstpage

1195

Lastpage

1206

Abstract

The band centers, rotational constants, absolute frequencies, and vacuum wavenumbers for¹²C¹⁶O2,¹³C¹⁶O2,¹²C¹⁸O2,¹³C¹⁸O2,¹²C¹⁶O¹⁸O,¹⁴C¹⁶O2, and¹⁴C¹⁸O2have been simultaneously computed from 590 beat frequency measurements between pairs of adjacent $00\\deg 1-[10\\deg 0,02\\deg 0]$ I and II band CO2laser transitions. The input data included the 56 beat frequencies measured between adjacent¹²C¹⁶O2rotational lines by Petersen et al. The absolute frequencies are directly related to the cesium frequency standard via the 29 442 483.315 (0.025) MHz 10.18 μm I-R (30) and the 32 134 266.891 (0.024) MHz 9.33 μm II-R(10) transitions in¹²C¹⁶O2which were measured by Evenson et al. The results described in this paper will provide the means for setting up easily reproducible secondary frequency standards in the $8.9-12.3 \\mu$ m wavelength band.

Keywords

Carbon dioxide lasers; Erbium; Frequency measurement; Isotopes; Laser stability; Laser transitions; Masers; Measurement standards; NIST; Rotation measurement; Wavelength measurement;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/JQE.1980.1070392

Filename

1070392