The far-infrared and microwave spectra of the CH radical in the v=1 level of the X2Π state

Jackson, Michael; Zink, L. R.; McCarthy, Michael; Pérez, Luis Alberto; Brown, John M.

doi:10.1016/j.jms.2007.11.001

Cited by 12 publications

(3 citation statements)

References 37 publications

(69 reference statements)

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“…As no satellite lines, which would provide a link between the two spin components F 1 and F 2 of the 2 P state were observed, it was necessary to fix the spin-orbit constant A v for at least one vibrational level. Previous studies of the ground state of CH using microwave and laser magnetic resonance techniques provide precise values for the A constants [13] of v = 0 and v = 1 which were used in the present fit. For the v = 5 level several higher order constants, extrapolated from the five lower levels were also fixed.…”

Section: Data and Analysismentioning

confidence: 99%

Revised molecular constants and term values for the X2Π state of CH

Colin

Bernath

2010

Journal of Molecular Spectroscopy

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Section: Data and Analysismentioning

confidence: 99%

Revised molecular constants and term values for the X2Π state of CH

Colin

Bernath

2010

Journal of Molecular Spectroscopy

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“…1 for the states covered in this study). To do this we analyze the experimental spectroscopic data available for the parent 12 CH 6,9–15,20,40,51,62–105 and 16 OH 8,21,31,38,41,43–47,52,53,106–158 isotopologues, using the Hamiltonian-free M arvel procedure, 1–5 and obtain high-accuracy empirical rovibronic energy levels with well-defined uncertainties. The empirical energy levels obtained allow the critical assessment of line lists 9,51–53 created previously for the two radicals.…”

Section: Introductionmentioning

confidence: 99%

Analysis of measured high-resolution doublet rovibronic spectra and related line lists of ¹²CH and ¹⁶OH

Furtenbacher

Hegedus

Tennyson

et al. 2022

Phys. Chem. Chem. Phys.

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“…Their wavelengths range from approximately 95.6 to 1714.1 μm. [13][14][15] Nearly 75% of these laser emissions have had their frequencies measured while several have been spectroscopically assigned [16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Jackson

Zink

2015

JoVE

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The generation and subsequent measurement of far-infrared radiation has found numerous applications in high-resolution spectroscopy, radio astronomy, and Terahertz imaging. For about 45 years, the generation of coherent, far-infrared radiation has been accomplished using the optically pumped molecular laser. Once far-infrared laser radiation is detected, the frequencies of these laser emissions are measured using a three-laser heterodyne technique. With this technique, the unknown frequency from the optically pumped molecular laser is mixed with the difference frequency between two stabilized, infrared reference frequencies. These reference frequencies are generated by independent carbon dioxide lasers, each stabilized using the fluorescence signal from an external, low pressure reference cell. The resulting beat between the known and unknown laser frequencies is monitored by a metal-insulator-metal point contact diode detector whose output is observed on a spectrum analyzer. The beat frequency between these laser emissions is subsequently measured and combined with the known reference frequencies to extrapolate the unknown far-infrared laser frequency. The resulting one-sigma fractional uncertainty for laser frequencies measured with this technique is ± 5 parts in 10 7. Accurately determining the frequency of far-infrared laser emissions is critical as they are often used as a reference for other measurements, as in the high-resolution spectroscopic investigations of free radicals using laser magnetic resonance. As part of this investigation, difluoromethane, CH 2 F 2 , was used as the far-infrared laser medium. In all, eight far-infrared laser frequencies were measured for the first time with frequencies ranging from 0.359 to 1.273 THz. Three of these laser emissions were discovered during this investigation and are reported with their optimal operating pressure, polarization with respect to the CO 2 pump laser, and strength. Video LinkThe video component of this article can be found at

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The far-infrared and microwave spectra of the CH radical in the v=1 level of the X2Π state

Cited by 12 publications

References 37 publications

Revised molecular constants and term values for the X2Π state of CH

Revised molecular constants and term values for the X2Π state of CH

Analysis of measured high-resolution doublet rovibronic spectra and related line lists of ¹²CH and ¹⁶OH

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

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The far-infrared and microwave spectra of the CH radical in the v=1 level of the X2Π state

Cited by 12 publications

References 37 publications

Revised molecular constants and term values for the X2Π state of CH

Revised molecular constants and term values for the X2Π state of CH

Analysis of measured high-resolution doublet rovibronic spectra and related line lists of 12CH and 16OH

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

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Analysis of measured high-resolution doublet rovibronic spectra and related line lists of ¹²CH and ¹⁶OH