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The study of state-selected ion-molecule reactions using the vacuum ultraviolet pulsed field ionization-photoion technique
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10.1063/1.2207609
/content/aip/journal/jcp/125/13/10.1063/1.2207609
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/13/10.1063/1.2207609
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Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram for the octopole-quadrupole photoionization apparatus. (1) To turbomolecular pump, (2) to turbomolecular pump, (3) molecular beam source chamber, (4) dual MCP photoelectron detector, (5) -metal shield, (6) electron TOF spectrometer, (7) photoionization chamber, (8) skimmer, (9) photoionization center, (10) wired ion gate lens, (11) nozzle and nozzle holder, (12) ion injection lenses, (13) short rf octopole , (14) reaction chamber, (15) reaction gas cell, (16) to turbomolecular pump, (17) long rf octopole , (18) entrance ion lenses for QMS, (19) QMS chamber, (20) liquid nitrogen cooled wall, (21) liquid nitrogen inlet, (22) to turbomolecular pump, (23) QMS, (24) exit ion lenses for QMS, Daly ion detector, (27) detector chamber, and (28) to turbomolecular pump. Taken from Ref. 46.

Image of FIG. 2.
FIG. 2.

TOF spectra of PFI-PEPICO ions demonstrating the effectiveness of the interleaved comb fast ion gate. (a) The gate is set to continuously transmit ions. (b) Double gate operation to transmit ions. (c) Double gate operation to transmit ions. The arrows point to arrival time of false coincidence ions transmitted during second gate opening. Taken from Ref. 46.

Image of FIG. 3.
FIG. 3.

TOF spectra of PFI-PESICO ions observed in collisions. (a) Primary ion PFI-PEPICO spectrum. (b) product ion PFI-PESICO spectrum. (c) product ion PFI-PESICO spectrum. Taken from Ref. 46.

Image of FIG. 4.
FIG. 4.

Absolute total cross sections for and formed in the reaction at (◻) and (▴) in the range of 0–17. Taken from Ref. 47.

Image of FIG. 5.
FIG. 5.

Collision energy (center of mass) dependence of proton transfer cross sections. Experimental cross sections are from Zhang et al. (Ref. 48) (filled circles) and Gerlich (Ref. 68) (filled triangles). Theoretical work includes quantum scattering work by Gilibert et al. (Ref. 70) (quantum CS, dotted line) and Huarte-Larrañaga et al. (Refs. 71 and 72) (quantum, dashed line), and quasiclassical trajectory calculations by Zhang et al. (Ref. 48). The dashed-dot line is a fit of the modified line-of-centers model [Eq. (5), LOC] convoluted by the experimental energy broadening mechanisms to the experimental cross sections by Zhang et al. The solid lines are the deconvoluted modified LOC cross sections. Taken from Ref. 48.

Image of FIG. 6.
FIG. 6.

PFI-PESICO measurements by Zhang et al. (Ref. 48) (filled circles) of proton-transfer cross sections as a function of vibrational quantum number at three translational energies, , 1.7, and . The error bars for the experimental cross sections represent the maximum absolute errors. The experimental results are compared with QCT calculations by Zhang et al. of the proton transfer and dissociation cross sections including zero-point energy restrictions. Taken from Ref. 48.

Image of FIG. 7.
FIG. 7.

Collision energy (center of mass) dependence of state-selected isotopic reaction channel cross sections. The results are compared to QCT calculations by Tang et al. (Ref. 81).

Image of FIG. 8.
FIG. 8.

Collision energy (center of mass) dependence of proton-transfer cross sections. Experimental cross sections are from Tang et al. (Ref. 49) (filled circles) and Turner et al. (Ref. 8) (open diamonds). LOC (dotted lines) refer to the modified line-of-centers model fits of the cross sections of Tang et al. The experimental measurements are compared with QCT calculations (open circles), and quantum scattering work by Chu et al. (Ref. 110) (solid lines), and Aquilanti et al. (Ref. 50) (Quantum). The dashed lines are the theoretical results of Chu et al. convoluted by the energy broadening mechanisms of the experiment by Tang et al. (Ref. 49).

Image of FIG. 9.
FIG. 9.

PFI-PESICO measurements by Tang et al. (Ref. 49) (filled circles) of proton-transfer cross sections as a function of vibrational quantum number at two translation energies, and . The PFI-PESICO errors bars represent statistical errors. The experimental results are compared with experimental results by Turner et al. (Ref. 8) (open diamonds), Govers and Guyon (Ref. 4) (upward pointing filled triangles), and Koyano and co-workers (Refs. 11 and 63) (downward pointing filled triangles). The measurements of Turner et al. are the averages of measurements at and . QCT calculations by Tang et al. (Ref. 49) of the proton transfer (open circles) and dissociation (dashed lines) cross sections including zero-point energy restrictions are also shown.

Image of FIG. 10.
FIG. 10.

Collision energy (center of mass) dependence of isotopic reaction channel cross sections. The results by Tang et al. (Ref. 81) (circles) are compared to experiments by Turner et al. (Ref. 8) (diamonds) and QCT calculations by Tang et al. (Ref. 81) (squares). Also shown are recent quantum scattering calculations by Tiwari et al. (Ref. 109).

Image of FIG. 11.
FIG. 11.

(a) TOF spectrum showing the PFI-PI and prompt background ion peaks (observed using an oscilloscope). The spectra were obtained with the VUV set at the . The solid and dot curves correspond to the measurements with and without the ringing scrambling electric field, respectively. (b) TOF spectrum showing the PFI-PI peak after the prompt background peak was blocked by a pulsed electric field applied to the lower repeller plate. Taken from Refs. 131 and 137.

Image of FIG. 12.
FIG. 12.

Comparison of the rotational-resolved PFI-PE spectrum (middle), the PFI-PI spectrum (upper), and the simulated (bottom) spectra for . The spectral simulation gives a rotational temperature of for NO. Taken from Refs. 131 and 137.

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/content/aip/journal/jcp/125/13/10.1063/1.2207609
2006-10-04
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The study of state-selected ion-molecule reactions using the vacuum ultraviolet pulsed field ionization-photoion technique
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/13/10.1063/1.2207609
10.1063/1.2207609
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