期刊
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
卷 50, 期 8, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6455/aa63a3
关键词
quantum-orbit theory; strong-field approximations; high-harmonic spectroscopy
资金
- National Natural Science Foundation of China [11274090, 11504083]
- Fundamental Research Funds for the Central Universities [GK201403002]
- Natural Science Foundation of Hebei province [A2015205161]
High-harmonic spectroscopy (HHS) is an emerging tool for probing the structure of molecules in ultrafast timescale. Here, through numerical solution of the time-dependent Schrodinger equation, we show that the present procedures in HHS cannot be directly applied to molecular ions such as H-2(+) with large internuclear distances R. For the latter, besides the ground state, the excited state of the system also contributes importantly to the harmonic emission. A simple model based on developed strong-field approximations and quantum-orbit theory is proposed, which allows us to extract the structural and dynamical information of molecular ions with large R from the harmonic spectra obtained with considering only the contributions of the short trajectory. Our work gives suggestions on tracing the bond length of a molecular orbital in a chemical reaction as the molecule is stretched to large R.
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