Robin S. McDowell, Chris W. Patterson, C. R. Jones, Melvin I. Buchwald, and John M. Telle, "Spectroscopy of the CF4 laser," Opt. Lett. 4, 274-276 (1979)
The frequencies of 28 lines of the 12CF4(ν2 + ν4) → ν2 laser have been measured with an accuracy of ±0.2 cm−1 for 12C16O2 pump lines from P(14) to R(24). The CF4 pump and laser transitions have been identified and the band origin and rotational constant of the ν2 level determined to be ν2 = 435.27 ± 0.06 cm−1, B2 = 0.19143 ± 0.00007 cm−1. From these constants the laser frequencies expected from any given pumping frequency can be predicted to within ±0.2 cm−1.
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626 and 828 are abbreviations for 12C16O2 and 12C18O2 respectively.
Offset = (CF4 absorption line frequency) − (CO2 laser line frequency).
Relative intensities calculated for T = 150 K.
Estimated accuracy ±0.2 cm−1.
Reference 2. Accuracy ±0.1 cm−1 unless stated otherwise; relative intensities are in the ratio S:MS:M ≈ 9:3:1. Q-branch lines, so identified by their preferred polarization, are indicated by Q.
S. S. Alimpiev, G. S. Baranov, N. V. Karlov, A. I. Karchevskii, V. L. Martsykian, Sh. Sh. Nabiev, B. G. Sartakov, E. M. Khokhlev, and V. G. Averin, paper presented at the IXth National Conf. on Coherent and Nonlinear Optics (Leningrad, 13–16 June 1978).
Line not explicitly identified in the CF4ν2 + ν4 absorption spectrum, but calculations indicate that it lies very near the specified pump line.
Upper level presumably reached by relaxation from an adjacent J level.
Unidentified laser line.
Calculated value.
This assumes that the J=30− upper state relaxes to J=31+; there seems to be no other way to account for the observed laser frequency. Only a few very weak, unassigned absorption features fall within ±1 GHz of the CO2 pump line.
Reference 9.
14 transitions of Ro(21) with a total intensity of 103 form a broad, unresolved absorption feature at +0.38 GHz from CO2 R(14).
8 transitions of R− (17), total intensity 15, are calculated to fall within ±0.6 GHz of CO2 R(16).
9 transitions of R− (22), total intensity 28, are calculated to fall within ±0.6 GHz of CO2 R(20).