Role of Feshbach resonances in the infrared multiphoton dissociation of small molecules

1985 ◽  
Vol 82 (2) ◽  
pp. 752-757 ◽  
Author(s):  
Claude Leforestier ◽  
Robert E. Wyatt
Keyword(s):  
Small Molecules ◽  
Infrared Multiphoton Dissociation ◽  
Feshbach Resonances ◽  
Multiphoton Dissociation

scholarly journals The infrared multiphoton dissociation of hexafluoroethane

1988 ◽  
Vol 66 (4) ◽  
pp. 609-614 ◽  
Author(s):  
Carl E. Brown ◽  
Donald R. Smith
Keyword(s):  
Gas Chromatography ◽  
Fourier Transform ◽  
High Frequency ◽  
High Sensitivity ◽  
Infrared Multiphoton Dissociation ◽  
Tunable Diode Laser ◽  
Product Analysis ◽  
Multiphoton Dissociation ◽  
First Time

The infrared multiphoton dissociation (IRMPD) of "neat" hexafluoroethane has been investigated for the first time. The stable products of photolysis are CF4, C2F4, C3F8, and C4F10. Product analysis involved tunable diode laser (TDL) and fourier transform infrared spectroscopy, as well as gas chromatography where applicable. The high sensitivity and resolution of the TDL allows for measurement of the stable products CF4 and C2F4 after irradiation by a single infrared laser pulse. The yield of CF3 radicals produced by the IRMPD of C2F6 as a function of fluence was measured via the TDL high frequency modulation technique. The role of added H2, leading to elimination of CF4 and increase of C2F4 as products, is clarified.

Chloroform Infrared Multiphoton Dissociation in the Presence of O2 and NO2¶

2005 ◽  
Vol 81 (4) ◽  
pp. 789 ◽  
Author(s):  
V. Mariana Freytes ◽  
Jorge Codnia ◽  
M. Laura Azcárate
Keyword(s):  
Infrared Multiphoton Dissociation ◽  
Multiphoton Dissociation

scholarly journals The Semiclassical Limit of the Gailitis Formula Applied to Electron Impact Broadening of Spectral Lines of Ionized Atoms

Atoms ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 29
Author(s):  
Sylvie Sahal-Bréchot
Keyword(s):  
Electron Impact ◽  
Classical Limit ◽  
Semiclassical Limit ◽  
Spectral Lines ◽  
Stark Broadening ◽  
Feshbach Resonances

The present paper revisits the determination of the semi-classical limit of the Feshbach resonances which play a role in electron impact broadening (the so-called “Stark“ broadening) of isolated spectral lines of ionized atoms. The Gailitis approximation will be used. A few examples of results will be provided, showing the importance of the role of the Feshbach resonances.

Amplification of Infrared Multiphoton Dissociation Efficiency in a Quadruple Ion Trap Using IR-Active Ligands

2006 ◽  
Vol 78 (24) ◽  
pp. 8512-8517 ◽  
Author(s):  
Michael Pikulski ◽  
Jeffrey J. Wilson ◽  
Apolonio Aguilar ◽  
Jennifer S. Brodbelt
Keyword(s):  
Ion Trap ◽  
Infrared Multiphoton Dissociation ◽  
Dissociation Efficiency ◽  
Multiphoton Dissociation

scholarly journals Role of SpoVA Proteins in Release of Dipicolinic Acid during Germination of Bacillus subtilis Spores Triggered by Dodecylamine or Lysozyme

2006 ◽  
Vol 189 (5) ◽  
pp. 1565-1572 ◽  
Author(s):  
Venkata Ramana Vepachedu ◽  
Peter Setlow
Keyword(s):  
Bacillus Subtilis ◽  
Small Molecules ◽  
Spore Germination ◽  
Dipicolinic Acid ◽  
Temperature Sensitive ◽  
Wild Type ◽  
Ph Optimum ◽  
Inner Membrane ◽  
Temperature Sensitive Mutants

ABSTRACT The release of dipicolinic acid (DPA) during the germination of Bacillus subtilis spores by the cationic surfactant dodecylamine exhibited a pH optimum of ∼9 and a temperature optimum of 60°C. DPA release during dodecylamine germination of B. subtilis spores with fourfold-elevated levels of the SpoVA proteins that have been suggested to be involved in the release of DPA during nutrient germination was about fourfold faster than DPA release during dodecylamine germination of wild-type spores and was inhibited by HgCl2. Spores carrying temperature-sensitive mutants in the spoVA operon were also temperature sensitive in DPA release during dodecylamine germination as well as in lysozyme germination of decoated spores. In addition to DPA, dodecylamine triggered the release of amounts of Ca2+ almost equivalent to those of DPA, and at least one other abundant spore small molecule, glutamic acid, was released in parallel with Ca2+ and DPA. These data indicate that (i) dodecylamine triggers spore germination by opening a channel in the inner membrane for Ca2+-DPA and other small molecules, (ii) this channel is composed at least in part of proteins, and (iii) SpoVA proteins are involved in the release of Ca2+-DPA and other small molecules during spore germination, perhaps by being a part of a channel in the spore's inner membrane.

Interrogation of N-Linked Oligosaccharides Using Infrared Multiphoton Dissociation in FT-ICR Mass Spectrometry

2006 ◽  
Vol 78 (14) ◽  
pp. 4990-4997 ◽  
Author(s):  
Katherine S. Lancaster ◽  
Hyun Joo An ◽  
Bensheng Li ◽  
Carlito B. Lebrilla
Keyword(s):  
Mass Spectrometry ◽  
Infrared Multiphoton Dissociation ◽  
Multiphoton Dissociation ◽  
Ft Icr
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