Pulse-shape effects and laser-induced avoided crossings in photodissociation

✍ Scribed by Eric E. Aubanel; André D. Bandrauk; Pascale Rancourt

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 525 KB
• Volume: 197
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(92)85794-b

✦ Synopsis

In a dressed state representation, laser-induced avoided crossings occur between field-molecule electronic surfaces giving rise to stable laser-induced resonances. It is shown that such states can be used to interpret short-pulse (subpicosecond and picosecond) induced molecular photodissociation. Time-dependent numerical calculations of photodissociation probabilities in Hz are used to illustrate pulse-shape effects on photodissociation. It is found that stable (long-lived) laser-induced resonances produce many kinetic energy peaks in photofragmentation, and are sensitive to pulse shapes. Short-lived resonances are insensitive to pulse details. At high intensities, nonadiabatic effects due to pulse-shape variation dominate.