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Vibrationally mediated photodissociation of ethene isotopic variants preexcited to the fourth C–H stretch overtone
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10.1063/1.2217743
/content/aip/journal/jcp/125/13/10.1063/1.2217743
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/13/10.1063/1.2217743

Figures

Image of FIG. 1.
FIG. 1.

Vibrational overtone excitation of the fourth overtone of the C–H stretch region of ethene: (a) measured room temperature photoacoustic (PA) absorption spectrum, (b) fitted PA spectrum, (solid curve), (c) jet-cooled action spectrum monitoring the yield of H photofragments following two color photodissociation and (d) simulated (solid curve) action spectrum. The dashed (-type) and dotted (-type) curves represent the fitted bands used to obtain the overall contour of the observed features in the PA and action spectra.

Image of FIG. 2.
FIG. 2.

Vibrational overtone excitation of the fourth overtone of the C–H stretch region of 1,2-trans--ethene: (a) measured room temperature photoacoustic (PA) absorption spectrum, (b) fitted (solid curve) PA spectrum, (c) jet-cooled action spectrum monitoring the yield of H and (d) D photofragments following two color photodissociation, (e) and simulated (solid line) action spectrum. The dashed (-type) and dotted (-type) curves represent the fitted bands used to obtain the overall contour of the features observed in the PA and action spectra.

Image of FIG. 3.
FIG. 3.

Vibrational overtone excitation of the fourth overtone of the C–H stretch region of 1,1--ethene: (a) measured room temperature photoacoustic (PA) absorption spectrum, (b) fitted (solid curve) PA spectrum, (c) jet-cooled action spectrum monitoring the yield of H and (d) D photofragments following two color photodissociation, and (e) simulated (solid line) action spectrum. The dashed (-type) and dotted (-type) curves represent the fitted bands used to obtain the overall contour of the features observed in the PA and action spectra.

Image of FIG. 4.
FIG. 4.

(a) Representative H (left) and D (right) Doppler broadened profiles obtained due to photodissociation of 1,2-trans--ethene preexcited to the fourth C–H stretch overtone. The solid curve is the Gaussian fitted to the measured profile (circles) and (b) the Maxwellian translational energy distribution extracted from (a), with the arrows marking the maximum translational energies of H and D in C–H and C–D bond fissions.

Tables

Generic image for table
Table I.

Rovibrational parameters of the bands in the fourth C–H stretch overtone region of ethene, 1,1--ethene, and 1,2-trans--ethene determined from the simultaneous fitting of the photoacoustic and action spectra. The ground state (GS) constants (Refs. 42–45) and those in parentheses were constrained in the fitting procedure. The numbers 1–6 refer to the bands observed in the spectrum, which are exhibited as dashed and dotted lines in Figs. 1–3.

Generic image for table
Table II.

C–H and C–D bond energies for the isotopic variants of ethene, and available energies and average translational energies for H and D losses in the photodissociation of molecules initially excited to the fourth C–H stretch overtone.

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/content/aip/journal/jcp/125/13/10.1063/1.2217743
2006-10-02
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Vibrationally mediated photodissociation of ethene isotopic variants preexcited to the fourth C–H stretch overtone
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/13/10.1063/1.2217743
10.1063/1.2217743
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