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Title: Direct evidence of the dominant role of multiphoton permanent-dipole transitions in strong-field dissociation of NO 2 +

Journal Article · · Physical Review A

We study laser-induced dissociation of a metastable NO2+ ion-beam target into N++O+, focusing on the prominent contribution by molecules breaking parallel to the polarization at high peak laser intensity (~1015 W/cm2). Our experimental results and time-dependent Schrödinger equation calculations show that, contrary to commonly held intuition that electronic transitions always prevail, the dominant process underlying this highly aligned dissociation is a multiphoton permanent-dipole transition involving only the electronic ground state and leading to its vibrational continuum. Strong-field permanent-dipole transitions should thus be considered generally, as they may play a significant role in other heteronuclear molecules. Moreover, their role should only grow in importance for longer wavelengths, a trending direction in ultrafast laser studies.

Research Organization:
Kansas State Univ., Manhattan, KS (United States); Oak Ridge Associated Universities (ORAU), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
FG02-86ER13491; AC05-06OR23100; PHY-2011864
OSTI ID:
1979614
Journal Information:
Physical Review A, Vol. 105, Issue 4; ISSN 2469-9926
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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