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Photochemical reaction dynamics in -acetylene complexes
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10.1063/1.3427414
/content/aip/journal/jcp/132/22/10.1063/1.3427414
http://aip.metastore.ingenta.com/content/aip/journal/jcp/132/22/10.1063/1.3427414

Figures

Image of FIG. 1.
FIG. 1.

TOFMS of the photoionized MB containing (5%) and (5%) in Xe buffer gas at nozzle pressure of 2.5 atm: (a) only the photoionization (probe) pulse at 193 nm (3 mJ/pulse; laser focused onto spot, ), averaging over 128 laser pulses; (b) both excitation (; 5 mJ/pulse; focused onto 0.4 mm diameter spot, ), and probe pulses [the same parameters as in (a)] at zero delay between the two, averaging over 128 laser pulses; (c) only the photoionization (probe) pulse at 193 nm (3 mJ/pulse; laser focused onto spot, ), averaging over 512 laser pulses.

Image of FIG. 2.
FIG. 2.

radical yield dependence on the excitation laser pulse energy: the -band and -band ; photoionization is induced by ArF excimer laser .

Image of FIG. 3.
FIG. 3.

REMPI action spectrum of the line profile measured for two lines of : the -band and -band .

Image of FIG. 4.
FIG. 4.

(1) REMPI action spectra of the vdW complexes. (a) Fitted spectrum. (b) Experimental spectrum measured for excitation radiation tuned within the spectral interval corresponding to the excitation of the molecule at the maximum of its absorption line in the -band; . (2) REMPI action spectra of the vdW complexes measured in the presence of both the excitation [-band; , ] and the tunable probe pulse.

Image of FIG. 5.
FIG. 5.

Structures of the nonplanar vdW complex (a) and the (HOOSCCH) intermediate (b).

Image of FIG. 6.
FIG. 6.

(a) REMPI action spectra of the radical recorded as in Fig. 4. (b) REMPI spectrum of the line recorded at resolution.

Image of FIG. 7.
FIG. 7.

The IR emission spectra of the HOSO radical measured for excitation radiation at the maximum of the -band; absorption. The spectra shown were scanned at 1 and delay times, respectively.

Image of FIG. 8.
FIG. 8.

Kinetic curves of the IR emission signals integrated over the respective IR emission bands [-band; (). (a) Kinetics in the entire measured time range. (b) Reduced time range, , for the integrated IR emission of the 910 and bands.

Image of FIG. 9.
FIG. 9.

Signal dependence on the delay time between excitation radiation pulse [-band; , ] and REMPI probing radiation pulse . Circles correspond to HOSO and squares to , the fitted curve is shown by a solid line.

Image of FIG. 10.
FIG. 10.

(a) Potential curve of the reaction (2). Configuration of the transition state. (b) 2D potential surface of the reaction (23).

Tables

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Table I.

Intensity and assignment of the TOFMS lines. The mixture at 2.5 atm nozzle pressure was used. Photoionization was performed at 193 nm, time range.

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Table II.

Rotational constants of the ground and excited electronic states of the vdW complex. The analyzed spectrum was scanned in the range of the -band [ rotational line]. The same values obtained from analysis of the MW spectra of the same complex for electronic ground state were taken from Ref. 33.

Generic image for table
Table III.

Values of the fundamental frequencies of the HOSO radical modes observed in the FTIR spectrum (Fig. 6) and the values of the diagonal anharmonicity factors for these modes.

Generic image for table
Table IV.

Decay rates of the IR emission integrated over each of the spectral bands (Fig. 7).

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Table V.

The values obtained for different IR active modes of HOSO radical, extrapolated to zero time.

Generic image for table
Table VI.

Geometrical parameters of the transition state of the vdW complex and of the intermediate. Calculations predict that acetylene is planar in the transition state and has cis-configuration, HOSO is also planar with structure, and CCH fragment is linear [coupled cluster/ and QCISD/ method].

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/content/aip/journal/jcp/132/22/10.1063/1.3427414
2010-06-11
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Photochemical reaction dynamics in SO2-acetylene complexes
http://aip.metastore.ingenta.com/content/aip/journal/jcp/132/22/10.1063/1.3427414
10.1063/1.3427414
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