An analytic algebraic approach to study the influence of molecular alignment and orientation on multiphoton excitation in intense laser fields

Abstract

The influence of molecular alignment and orientation on multiphoton vibrational excitation of diatomic molecules H 2 , HD, and D 2 is studied by an analytical algebraic approach. The explicit expressions of the timeevolution operator and the excitation probability are given. The long-time average absorbed energy spectra and the time-dependent absorbed energy are obtained. Results show that the impact of molecular orientation on the multiphoton resonant excitation is decided by the molecular type and molecular anharmonicity. This is valuable for controlling the vibrational excitation of molecules, which is relevant to the whole field of molecular physics and physical chemistry. Furthermore, good agreement with numerical simulation is achieved.

Editorial

“…Molecular Physics has published a number of research papers in this area recently. These papers include: a study of the photoelectron angular distributions of the ammonia molecule with rotational resolution by Katharine Reid and coworkers [1]; studies of the rotationally resolved photoelectron spectrum of Xe 2 [2]; a time resolved study of photoelectron angular distributions in helium [3]; a study of alignment and orientation in multiphoton ionization [4]; and theoretical studies of the photoelectron spectra of NO 2 [5] and of the HNCl À anion [6].…”

Probing the Local Near-Field Intensity of Plasmonic Nanoparticles in the Mid-infrared Spectral Region

“…Indeed, previous theoretical studies have suggested that the plasmon electric field can significantly affect the vibrational anharmonicity of molecules adsorbed on metal nanostructure surfaces . In addition, it has been reported that anharmonicity is correlated with molecular orientation …”

“…71 In addition, it has been reported that anharmonicity is correlated with molecular orientation. 77 In summary, we have developed a method to probe the local near-field intensity of plasmonic nanoparticles in the midinfrared spectral region by investigating interfacial vibrational relaxation dynamics of 4-NTP SAM on Au films and surfaces…”