X-ray absorption of N(2) accompanied by infrared-induced transitions between the ungerade and gerade core levels

作者：Velkov Yasen^*; Liu Ji Cai; Wang Chuan Kui; Gel'mukhanov Faris

来源：Journal of Physics B: Atomic, Molecular and Optical Physics , 2008, 41(14): 145601.

DOI：10.1088/0953-4075/41/14/145601

We study a two-colour pump-probe scheme of x-ray absorption accompanied by core-hole hopping in the field of a strong IR laser. The process is exemplified for fixed-in-space and randomly oriented homonuclear diatomic molecules N(2) near the 1 sigma(u) -> 1 pi(g) x-ray absorption transition. The laser field mixes the core holes of opposite parities and causes Rabi splitting of the core-excited states. The IR field results in spectral broadening and shifts of the x-ray resonances as well as decrease of x-ray photoabsorption. The Stark broadening of the x-ray absorption spectrum depends on the orientation of the molecule and the angle between the polarization vectors of the x-ray and IR fields. The spectral changes caused by the IR field are weaker for randomly oriented molecules in comparison with fixed-in-space molecules.

• 出版日期2008-7-28
• 单位山东师范大学