title: Enhancement of molecular modes by electronically resonant multipulse excitation: further progress towards mode selective chemistry.
abstract: We show that molecular vibrations induced by resonant excitation pulses can be enhanced by pulse trains, compared to Fourier-limited pulses of equal pulse energy. As a proof-of-principle, a low frequency mode of Nile Blue at 600 cm(-1) is observed and amplified in a pump and probe experiment. In addition to previous experiments in our group, an increased population transfer to the excited electronic state is identified as an important element of the underlying physical mechanism. These results suggest an enhancement on the level of individual molecules rather than a macroscopic effect.
authors.affiliation: Physikalische Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse, D-35043 Marburg, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Hauer
authors.forename: Tiago
authors.initials: T
authors.lastname: Buckup
authors.forename: Marcus
authors.initials: M
authors.lastname: Motzkus
mesh_terms: D002627:Chemistry, Physical / Q000379:methods*; D004581:Electronics; D004583:Electrons; D005583:Fourier Analysis; D007834:Lasers; D008968:Molecular Conformation; D009991:Oscillometry; D010078:Oxazines / Q000737:chemistry; D013997:Time Factors
chemical_list: D010078:Oxazines; C008619:Nile Blue