Photofragment imaging of Kr{sub 2} and ArKr van der Waals molecules following two-photon excitation

Journal Article · Thu Dec 14 04:00:00 EST 1995 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/j100050a006· OSTI ID:171387

Heck, A J.R. ^[1]; Neyer, D W; Chandler, D W ^[1]; Zare, R N ^[2]

---

1. Sandia National Lab., Livermore, CA (United States)
2. Stanford Univ., CA (United States)

Photofragment imaging is used to study the fragmentation and ionization dynamics of Kr{sub 2} and ArKr upon absorption of two or more photons ({lambda} 211-220 nm). For Kr{sub 2} two-photon-excited electronic states are studied that are in energy near Kr (5p) states. All studied Kr{sub 2} two-photon-excited electronic states show competition between ionization and predissociation. The photofragment images also reveal higher order absorption processes in which three-photon absorption of the dimer is followed by dissociation into ground state and excited state Kr fragments. Dissociation after three-photon absorption leads to Kr photofragments. The Ar photofragment ion images and the multiphoton ionization spectra show competition between ionization and predissociation of these two-photon-excited ArKr states. As with the Kr{sub 2} dimer, the ion images also reveal higher order absorption processes in which three-photon absorption of ArKr is followed by dissociation into neutral Kr ground and Ar excited state fragments. The angular distributions of the fragments formed after predissociation at the two-photon resonant levels and after three-photon absorption are both anisotropic. Markedly different contributions of three-photon absorption and predissociation processes are observed in the ion images of the two electronic bands of ArKr. 52 refs., 10 figs., 5 tabs.

• Sponsoring Organization: USDOE
• OSTI ID: 171387
• Journal Information: Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 50 Vol. 99; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
66 PHYSICS
ARGON
DIMERS
DISSOCIATION
ENERGY ABSORPTION
EXCITED STATES
FRAGMENTATION
GROUND STATES
IMAGES
KRYPTON
MOLECULES
PHOTOCHEMICAL REACTIONS
PHOTOIONIZATION