期刊
PHYSICAL REVIEW LETTERS
卷 87, 期 19, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.87.193002
关键词
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The dissociation of excited state Br-2 is probed with the novel technique of ultrafast soft x-ray photoelectron spectroscopy. Excited Br-2 molecules are prepared in the dissociative (1)Pi (u) state with 80 fs, 400 nm pulses, and a series of photoelectron spectra are obtained during dissociation with pulses of soft x-ray light (47 nm, 26.4 eV, 250 fs). The formation of Br atoms is readily detected and the data support an extremely fast dissociation time for Br-2 on the order of 40 fs. Amplitudes of the pump-probe features reveal that the ionization cross section of atomic Br at 47 nm is similar to 40 times larger than that of Br-2.
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