Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.083001
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Funding
- Department of Energy, Office of Basic Energy Science Science
- COST [CM0702]
- Stifterverband fur die Deutsche Wissenschaft
- Fonds der Chemischen Industrie
- Deutsche Forschungsgemeinschaft [SFB 450]
- NDSEG
- CNR-INFM Democritos
- INSTM Crimson
- National Science Foundation [NSF PHY05-51164]
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High harmonic spectra show that laser-induced strong field ionization of water has a significant contribution from an inner-valence orbital. Our experiment uses the ratio of H2O and D2O high harmonic yields to isolate the characteristic nuclear motion of the molecular ionic states. The nuclear motion initiated via ionization of the highest occupied molecular orbital (HOMO) is small and is expected to lead to similar harmonic yields for the two isotopes. In contrast, ionization of the second least bound orbital (HOMO-1) exhibits itself via a strong bending motion which creates a significant isotope effect. We elaborate on this interpretation by solving the time-dependent Schrodinger equation to simulate strong field ionization and high harmonic generation from the water isotopes. We expect that this isotope marking scheme for probing excited ionic states in strong field processes can be generalized to other molecules.
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