Concurrent photodissociation and multiphoton ionization processes in CH3I from 266–307 nm

Jiang, Yifeng; Giorgi-Arnazzi, Maria R.; Bernstein, R. B.

doi:10.1016/0301-0104(86)87048-3

Cited by 46 publications

(14 citation statements)

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“…Methyl iodide, as the simplest molecule of alkyl iodides and a prototypical system for experimental investigation and theoretical model of photodissociation processes in polyatomic molecules [3,4], lots of multiphoton ionization and dissociation of the molecule have been studied [5][6][7][8][9][10][11][12][13][14][15][16][17]. There still exist lots of different views about the multiphoton ionization mechanism and the assignments of some vibrational structures of Rydberg state.…”

Section: Introductionmentioning

confidence: 99%

“…There still exist lots of different views about the multiphoton ionization mechanism and the assignments of some vibrational structures of Rydberg state. Jiang et al [17] have studied the concurrent photodissociation and multiphoton ionization processes of methyl iodide in the 266 -307 nm region using a two color, pulsed laser, time-of-flight mass spectrometer. Their studies have confirmed the view that the predominant pathway to ions is from photodissociation followed by ionization of the neutral CH 3 and I photofragment.…”

Section: Introductionmentioning

confidence: 99%

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Mass resolved MPI spectra of methyl iodide in the 430–490 nm region

Zhang

Wang

Lou

et al. 2001

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mass resolved MPI spectra of methyl iodide in the 430–490 nm region

Zhang

Wang

Lou

et al. 2001

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…respectively 42. Because we are concerned with detecting direct excitation of the perpendicular transitions, which correlate with I, we present images for the I͑ 2 P 3/2 ͒ fragment only.…”

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confidence: 99%

Photofragment imaging by sections for measuring state-resolved angle-velocity differential cross sections

Syage

1996

The Journal of Chemical Physics

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We describe a two-dimensional ͑2D͒ imaging technique for recording state-specific photofragment angle-velocity (,v) distributions. In these experiments the photofragment images are recorded as 2D sections of the 3D angular distributions using state-specific ionization in a time-of-flight mass spectrometer. We compare this method to previous methods that record 2D projections of the 3D distribution. The 2D sections represent cartesian flux-velocity maps in the center of mass and are related to angle-velocity differential cross sections by a simple geometric factor. Two studies are highlighted. In the first, new results are presented for the A state photodissociation of CH 3 I to CH 3 ϩI. (,v) images are presented for I atom in the 2 P 3/2 and 2 P 1/2 spin-orbit states following photodissociation at 266 and 304 nm. The principal result is detection of the weak perpendicular transitions to the 3 Q 1 state ͑at 304 nm͒ and the 1 Q state ͑at 266 nm͒ that underlie the strong parallel transition to the 3 Q 0 state. We also report the ratio of cross sections Ќ / ʈ , the anisotropy and branching ratio for I͑ 2 P 3/2 ͒ and I͑ 2 P 1/2 ͒, and the 3 Q 0 -1 Q surface crossing probability. In a second study the photodissociation of O 3 to O 2 (v)ϩO͑ 3 P jϭ2,1,0 ͒ was measured. A bimodal anisotropic velocity distribution was measured for O͑ 3 P͒ corresponding to maximum in the O 2 (v) vibrational distribution of vϭ15 and 27, in general agreement with a previous measurement. The anisotropies of the high-and low-velocity components were measured to be ␤Ϸ1.1 and 0.4, respectively.

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“…(The recording of the signal is in the same mode as described previously. 15 ) The output is digitized every 2 ns and averaged for 1000 laser pulses.…”

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confidence: 99%

“…1213 The biasing of the TOFMS ionizer plates at the indicated electric field causes the separation of the initially upward-moving component ions from the downward component. The laser wavelength is 281.74 nm (energies 1.5-3 mJ/ pulse), which allows both the photofragmentation of (Table I). CH3I and the selective detection of recoiling I( 2 Pi/2) via two-photon resonance, one-photon ionization to form I + , detected 15 by TOFMS. Figure 1 shows TOF spectra of the I + signal originating as follows: The first is from the direct unfocused beam (hexapole rod voltage at 0).…”

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confidence: 99%

Asymmetry of the Polarized-Laser-Induced Photofragmentation of Oriented CH3I Molecules

1987

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The degree of orientation of CH3I in rotation-state-selected, oriented-molecule beams has been measured via the asymmetry of the angular distribution of the I( 2 Pm) photodissociation product from the linearly-polarized-laser-induced photofragmentation of CH3I in (parent) rotational states | JKM) = 1111), I 212), I 211), and | 222). For the latter state the up/down asymmetry is nearly 4/1 (less for the other states). Partial disorientation of the CH3I due to hyperfine coupling in a weak electric field has also been demonstrated.

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Concurrent photodissociation and multiphoton ionization processes in CH3I from 266–307 nm

Cited by 46 publications

References 47 publications

Mass resolved MPI spectra of methyl iodide in the 430–490 nm region

Mass resolved MPI spectra of methyl iodide in the 430–490 nm region

Photofragment imaging by sections for measuring state-resolved angle-velocity differential cross sections

Asymmetry of the Polarized-Laser-Induced Photofragmentation of Oriented CH3I Molecules

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