Acetylene-vinylidene isomerization in ultrashort intense laser fields studied by triple ion-coincidence momentum imaging

Journal Article · Thu Feb 28 04:00:00 EST 2008 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.2828557· OSTI ID:21103852

Hishikawa, Akiyoshi ^[1]; Matsuda, Akitaka ^[1]; Takahashi, Eiji J; Fushitani, Mizuho ^[1]

---

1. Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki, Aichi 444-8585 (Japan)

The isomerization of acetylene via hydrogen migration in intense laser fields (8x10{sup 14} W/cm{sup 2}) has been investigated by coincidence momentum imaging of the three-body Coulomb explosion process, C{sub 2}H{sub 2}{sup 3+}{yields}H{sup +}+C{sup +}+CH{sup +}. When ultrashort (9 fs) laser pulses are used, the angle between the momenta of C{sup +} and H{sup +} fragments exhibits a sharp distribution peaked at a small angle ({approx}20 deg.), showing that the hydrogen atom remains near the original carbon site in the acetylene configuration. On the other hand, a significantly broad distribution extending to larger momentum angles ({approx}120 deg.) is observed when the pulse duration is increased to 35 fs, indicating that the ultrafast isomerization to vinylidene is induced in the longer laser pulse.

• OSTI ID: 21103852
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 8 Vol. 128; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ACETYLENE
CARBON IONS
DISSOCIATION
HYDROGEN IONS 1 PLUS
ISOMERIZATION
LASER RADIATION
PHOTOCHEMISTRY
PHOTOLYSIS
PHOTON-MOLECULE COLLISIONS