Abstract

The effect of the spatial arrangement of a molecular internuclear axis and its plane of rotation in the multiphoton nonresonant excitation process is investigated. We consider diatomic or symmetric-top molecules; the internuclear axis is regarded to be fixed in space during the excitation time interval. Steric conditions preparing the initial angular distribution of the internuclear axis in the excited state are obtained, both for resolved and unresolved magnetic levels and for linearly or circularly polarized incident radiation. The intensities of individual rotational lines or rotational branches are obtained after averaging over all spatial orientations.

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