title: High-harmonic transient grating spectroscopy of NO2 electronic relaxation.
abstract: We study theoretically and experimentally the electronic relaxation of NO(2) molecules excited by absorption of one ∼400 nm pump photon. Semiclassical simulations based on trajectory surface hopping calculations are performed. They predict fast oscillations of the electronic character around the intersection of the ground and first excited diabatic states. An experiment based on high-order harmonic transient grating spectroscopy reveals dynamics occurring on the same time scale. A systematic study of the detected transient is conducted to investigate the possible influence of the pump intensity, pump wavelength, and rotational temperature of the molecules. The quantitative agreement between measured and predicted dynamics shows that, in NO(2), high harmonic transient grating spectroscopy encodes vibrational dynamics underlying the electronic relaxation.
authors.affiliation: Université de Bordeaux-CNRS-CEA, CELIA, UMR5107, F-33400 Talence, France.
authors.forename: H
authors.initials: H
authors.lastname: Ruf
authors.forename: C
authors.initials: C
authors.lastname: Handschin
authors.forename: A
authors.initials: A
authors.lastname: Ferré
authors.forename: N
authors.initials: N
authors.lastname: Thiré
authors.forename: J B
authors.initials: JB
authors.lastname: Bertrand
authors.forename: L
authors.initials: L
authors.lastname: Bonnet
authors.forename: R
authors.initials: R
authors.lastname: Cireasa
authors.forename: E
authors.initials: E
authors.lastname: Constant
authors.forename: P B
authors.initials: PB
authors.lastname: Corkum
authors.forename: D
authors.initials: D
authors.lastname: Descamps
authors.forename: B
authors.initials: B
authors.lastname: Fabre
authors.forename: P
authors.initials: P
authors.lastname: Larregaray
authors.forename: E
authors.initials: E
authors.lastname: Mével
authors.forename: S
authors.initials: S
authors.lastname: Petit
authors.forename: B
authors.initials: B
authors.lastname: Pons
authors.forename: D
authors.initials: D
authors.lastname: Staedter
authors.forename: H J
authors.initials: HJ
authors.lastname: Wörner
authors.forename: D M
authors.initials: DM
authors.lastname: Villeneuve
authors.forename: Y
authors.initials: Y
authors.lastname: Mairesse
authors.forename: P
authors.initials: P
authors.lastname: Halvick
authors.forename: V
authors.initials: V
authors.lastname: Blanchet