Journal ArticleDOI
The temperature-dependent absorption spectrum of the v3 band of SF6 at 10·6 μm
Andrew V. Nowak,John L. Lyman +1 more
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TLDR
In this paper, a band contour model, which makes use of known spectroscopic constantd and the experimental results, satisfactorily accounts for the observed temperature dependence of the absorption coefficient.Abstract:
Mixtures of SF 6 diluted by argon were heated behind an incident shock front in the range 400 to 1500K. Absorption measurements at 11 wavelengths near 10·6 μm were made on the post-shock, equilibrated gas using a CO 2 laser. A band contour model, which makes use of known spectroscopic constantd and the experimental results, satisfactorily accounts for the observed temperature dependence of the absorption coefficient. We are able to estimate the identity of the transitions responsible for absorption of the laser radiation.read more
Citations
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Infrared‐laser‐induced unimolecular reactions
TL;DR: In infrared photochemistry, a powerful electromagnetic wave in the infrared remains in the electronic ground state (in the Born-Oppenheimer sense) but their vibrational modes may become highly excited.
Journal ArticleDOI
A model for unimolecular reaction of sulfur hexafluoride
TL;DR: In this paper, a model based on a rate equation formalism has been developed that includes unimolecular dissociation, collisional energy transfer (V-T processes), and absorption and emission of laser radiation.
Journal ArticleDOI
Enrichment of boron, carbon, and silicon isotopes by multiple‐photon absorption of 10.6‐μm laser radiation
TL;DR: In this paper, the polyatomic molecules SF6, BCl3, CF2Cl2, and SiF4 have been irradiated in the presence of H2 or N2 using intense focused CO2 laser pulses.
Journal ArticleDOI
Photon‐enhanced dissociative electron attachment in SF6 and its isotopic selectivity
C. L. Chen,P. J. Chantry +1 more
TL;DR: In this article, a tunable cw CO2 laser focused collinearly with an electron beam inside a collision chamber is used to produce SF−5 by dissociative attachment of very low energy electrons to SF6.
Journal ArticleDOI
Identification of the SF6 transitions pumped by a CO2 laser
TL;DR: In this paper, the quantum numbers of the SF 6 transitions from the ground state to v 3 = 1 that fall within ± 1.5 G Hz of the CO 2 P(14), P(18), and P(20) laser lines have been assigned.
References
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Journal ArticleDOI
Infrared Double Resonance in Sulfur Hexafluoride
TL;DR: In this paper, the authors monitored the relaxation of sulfur hexafluoride by observation of infrared absorption intensities following passage of an infrared laser pulse through the gas, and concluded that the rate-controlling step was the vibration→translation relaxation of the ν6 level at 363 cm−1.
Journal ArticleDOI
Photon Echoes in Gases
TL;DR: In this article, the behavior of the photon echo produced by an inhomogeneously broadened spectral line is analyzed, with particular emphasis on the effect of spatial degeneracy of the molecular energy levels.
Journal ArticleDOI
The vapor phase Raman spectra, Raman band contour analyses, and Coriolis constants of the spherical top molecules MF6 (MS, Se, Te, Mo, W, or U), M(CH3)4 (MC, Si, Ge, Sn, or Pb), P4, As4 and OsO4
TL;DR: In this article, the Raman spectra of four types of spherical top molecule have been recorded in the vapor phase at temperatures between 20 and 680°C. Fundamental frequencies are reported together with, where possible, the separation of the rotational branch maxima, Δ ν OP, RS of each fundamental.