Dynamic alignment of CH3I by strong picosecond laser pulses

Kaziannis, S.; Siozos, Panagiotis; Kosmidis, C.

doi:10.1016/j.cplett.2004.11.050

Cited by 20 publications

(20 citation statements)

References 31 publications

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“…These components correspond to CH 3 + ions ejected from differently charged states of the parent ion. The outer pair of peak components has been attributed to dissociation channels within triply charged parent ions [P 3+ ] [30]. In the same figure (Fig.…”

Section: Resultsmentioning

confidence: 88%

“…It is believed that H 2 + ions are liberated from lighter (with respect to the parent ion) precursors which have been aligned with the polarization vector (this accounts for the stronger dependence on laser polarization) and they have higher charge multiplicity (higher recoil energies). It should be mentioned that, as it has been proposed earlier, the higher charged state of the parent ions for alkyl iodides at these laser intensities is P n+ with n ≤ 3 and it is much lower compared to that achieved in femtosecond experiments performed at the same laser intensity [9,30].…”

Section: Resultsmentioning

confidence: 89%

“…The analysis of our CH 3 I data offers some additional information. This molecule is the simplest alkyl iodide molecule and the signal that corresponds to [P I] + fragment exhibits a complex structure, which has been analyzed recently [30]. In Fig.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Molecular hydrogen ion elimination from alkyl iodides under strong laser beam irradiation

Kosmidis

Kaziannis

Siozos

et al. 2006

International Journal of Mass Spectrometry

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 89%

See 1 more Smart Citation

Molecular hydrogen ion elimination from alkyl iodides under strong laser beam irradiation

Kosmidis

Kaziannis

Siozos

et al. 2006

International Journal of Mass Spectrometry

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“…Later, the same group reported their new results of CH 3 I in the intense picosecond laser field, with improved resolution of the time-offlight ͑TOF͒ mass spectrometer. 23 They assigned some Coulomb explosion channels and measured the KERs of CH 3 + ions from different channels, while no reports about the assignments of H + , C n+ , CH + , and CH 2 + fragments generated by the Coulomb explosion of CH 3 I in the intense laser field have been found.…”

Section: Introductionmentioning

confidence: 99%

Ionization and dissociation of CH3I in intense laser field

Liu

Yang

Gao

et al. 2007

The Journal of Chemical Physics

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The ionization-dissociation of methyl iodide in intense laser field has been studied using a reflection time-of-flight mass spectrometry (RTOF-MS), at a laser intensity of < or =6.6x10(14) W/cm(2), lambda=798 nm, and a pulse width of 180 fs. With the high resolution of RTOF-MS, the fragment ions with the same M/z but from different dissociation channels are resolved in the mass spectra, and the kinetic energy releases (KERs) of the fragment ions such as I(q+) (q=1-6), CH(m) (+) (m=0-3), C(2+), and C(3+) are measured. It is found that the KERs of the fragment ions are independent of the laser intensity. The fragments CH(3) (+) and I(+) with very low KERs (<1 eV for CH(3) (+) and <0.07 eV for I(+)) are assigned to be produced by the multiphoton dissociation of CH(3)I(+). For the fragments CH(3) (+) and I(+) from CH(3)I(2+), they are produced by the Coulomb explosion of CH(3)I(2+) with the interaction from the covalent force of the remaining valence electrons. The split of the KER of the fragments produced from CH(3)I(2+) dissociation is observed experimentally and explained with the energy split of I(+)((3)P(2)) and I(+)((3)P(0,1)). The dissociation CH(3)I(3+)-->CH(3) (+)+I(2+) is caused by Coulomb explosion. The valid charge distance R(c) between I(2+) and CH(3) (+), at which enhanced ionization of methyl iodide occurs, is obtained to be 3.7 A by the measurements of the KERs of the fragments CH(3) (+) and I(2+). For the CH(3)I(n+) (n> or =3), the KERs of the fragment ions CH(3) (p+) and I(q+) are attributed to the Coulomb repulsion between CH(3) (p+) and I(q+) from R(c) approximately 3.7 A. The dissociation of the fragment CH(3) (+) is also discussed. By the enhanced ionization mechanism and using the measured KER of I(q+), all the possible Coulomb explosion channels are identified. By comparing the abundance of fragment ions in mass spectrum, it is found that the asymmetric dissociation channels with more charges on iodine, q>p, are the dominant channels.

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“…Recently, the interaction of nanosecond laser with CH 3 I cluster was investigated widely, where multiply charged ions with high energy were observed experimentally [4][5][6][7]. Luo et al investigated the interaction of nanosecond laser with CH 3 I in diffused beam and pulsed beam by a time-of-flight mass spectrometer [8].…”

Section: Introductionmentioning

confidence: 99%