Carrier envelope phase effects in photofragmentation: Orientation versus alignment

• Published in: Optics and spectroscopy Vol. 111; no. 4; pp. 606 - 617
• Main Authors: Korolkov, M. V., Weitzel, K. -M.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01.10.2011
• Subjects: Coherent Effects in Optical and Atomic-Molecular Processes; Lasers; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; Wave Packet; Chirp Laser Pulse; Space Time Representation; Oriented Molecule; Carrier Envelope Phase
• ISSN: 0030-400X; 1562-6911
• DOI: 10.1134/S0030400X1111018X

The optically induced fragmentation of deuterium chloride ions (DCl + ) has been investigated by means of computer simulation within the Schrödinger wave-function formalism for three lowest 2 gV electronic states coupled by IR-laser pulse with 34.6 fs duration. We demonstrate that the dependence of dissociation yields as function of the carrier envelope phase (CEP) of few-cycle laser pulses can be fundamentally different (2π or π periodicity) for oriented and aligned ions. To achieve a deep insight in mutual electronic nuclear dynamics we investigate the time dependence of fragmentation yields and vibrational populations as well as the space-time representation of electronic wave function probability dynamics for few selected cases. Ultimately we suggest an approach for distinguishing oriented from aligned molecular ensembles. Further-more the current concept provides access to directional product ion beams (D + or/and Cl + ) by proper selection of the CEP.