Accurate frequencies and wavelengths of CO2 laser lines

doi:10.1016/0030-4018(70)90048-9

Optics Communications

Volume 2, Issue 2, July 1970, Pages 77-80

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Abstract

The frequencies, wave numbers, and wavelengths of 120 CO₂ laser lines calculated on the basis of recent absolute frequency measurements in the 9.3 μm and 10.6 μm regions and the previously determined accurate rotational constants are presented. The accuracy is of the order of 1 ppm.

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Photoacoustic spectroscopy with mica and graphene micro-mechanical levers for multicomponent analysis of acetic acid, acetone and methanol mixture
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Citation Excerpt :
A continuous wave CO2 laser (Edinburgh Instruments WL-8-GT, Livingstone, Scotland) emitting in a spectral range of 9–11 μm was used as an excitation source. This laser has typically 60 laser lines and it was tuned to fixed wavelength by a diffraction grating [31]. The full-width at half maximum of the laser lines is typically in the order of 10−4 μm at 300 K (estimated using Spectraplot software [32]).
Multilayer graphene and mica cantilevers as part of an optical microphone in combination with CO₂ laser emitting in the range of 9–11 μm were employed in a multicomponent analysis of a mixture of acetone, acetic acid and methanol by photoacoustic spectroscopy. Using these elements, the detection limits of mica circle cantilever were 0.54, 0.80 and 24.8 ppm for acetic acid, methanol and acetone, respectively; these limits were approximately 5 times lower than the detection limit of the highest-class microphone used in this study. The multicomponent analysis was performed using five selected CO₂ laser lines and a classical method of least squares. Despite the inaccuracies of our system, very good agreement between the concentration of acetic acid calculated from the photoacoustic signal and from weighing of concentration standards (~3%) was found when measuring the signal in a 10:1:1 mixture of acetone:acetic acid:methanol at five selected laser lines. The absorption coefficient of acetic acid at 10.24 μm was almost 500 times higher than that of acetone, which showed the good ability of this method to detect acetic acid in a high background of acetone, which can be beneficial in the medical analysis of breath.
Supernarrow saturated absorption resonances
1985, Physics Reports
The paper reviews the state-of-the-art in production of supernarrow resonances in the optical band by the method of saturated absorption and their application in spectroscopy. The influence of collisions, transit and other effects on the resonance width is discussed. Presented are the results of investigations of elastic scattering at collisions, hyperfine structure of vibrational-rotational transitions in molecules, second-order Doppler effects by using supernarrow resonances. Various physical applications of supernarrow optical resonances are reported.
Analysis of Doppler-limited spectra of the CO stretch fundamental of CD<inf>3</inf>OH
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Doppler-limited linewidth diode laser spectra of the low-J P and R branches of the ν₄ band (CO stretch) of CD₃OH were recorded and analyzed. Hindered internal rotation and molecular asymmetry are handled by exact matrix diagonalization. Fermi resonance between ν₄ and the τ = 1, n = 3 and n = 4 torsional levels of the ground vibration state was found to be responsible for several anomalous spectral features. Direct LMS fitting of the data to a set of 11 excited-state parameters lead to the assignment of 160 lines with a rms error of ±0.00088 cm⁻¹.
Collision-assisted multiple step excitation of CH<inf>3</inf>F by irradiation with a TEA CO<inf>2</inf> laser
1981, Chemical Physics Letters
Laser spectroscopy of ethylene with waveguide CO<inf>2</inf> and N<inf>2</inf>O lasers
1979, Journal of Molecular Spectroscopy
Fifty Doppler-broadened absorption lines of ethylene have been measured within large profiles CO₂ or N₂O lase lines. These laser lines are produced by a high pressure waveguide laser and have a full width between 200 and 900 MHz. Eleven absorption lines, the more intense ones, have been assigned to the ν₇ band of C₂H₄. The other absorption lines must belong to hot bands or to the ν₇ band of H₂ ¹²C¹³CH₂.
A laser induced fluorescence study of vibrational energy transfer processes in cyclopropane
1978, Chemical Physics
Results of infrared laser induced fluorescence studies on cyclopropane are presented. Molecules were excited from the ground state to the v₁₀ level of cyclopropane using a Q-switched CO₂ laser operating on either the P(14) or P(20) transition of the 9.6 μ branch. Fluorescence was observed from the v₆, v₈, v₁₀ + v₁₁ and v₅ + v₁₀ levels of cyclopropane. The self-deactivation of vibrationally excited cyclopropane through V → T/R processes was found to have a rate of 8.0 ± 1.5 ms⁻¹ torr⁻¹. Deactivation by rare gas collisions was also studied with comparison to simple V → T and V → R theories. V → V equilibration processes are discussed involving the v₆, v₈, v₁₀, v₁₁, and v₁₀ + v₁₁ levels.

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Accurate frequencies and wavelengths of CO2 laser lines

Abstract

Appl. Phys. Letters

Appl. Phys. Letters

Appl. Phys. Letters

Phys. Rev. Letters

Accurate frequencies and wavelengths of CO₂ laser lines