日本結晶学会誌
Online ISSN : 1884-5576
Print ISSN : 0369-4585
ISSN-L : 0369-4585
特集 SACLA
SACLAの高強度X線照射下の原子・分子の動的振舞い
福澤 宏宣上田 潔
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2017 年 59 巻 1 号 p. 29-33

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We have investigated ultrafast electronic and nuclear dynamics in atoms, molecules and clusters induced by very intense(~50 μJ/μm2), ultrashort(~10 fs) pulses generated by SACLA. At photon energy of 5.0~5.5 keV, we could identify that Xen+ with n up to 26 is produced, evidencing occurrence of deep inner-shell ionization and sequential electronic decay cycles repeated multiple times in the xenon atom within ~10 fs pulse duration. The results for momentum-resolved multiple ion coincidence study on iodine-contained organic molecules(iodomethane and 5-iodouracil)illustrates that the charges are produced by the cycles of deep inner-shell ionization of the iodine atom and sequential electronic decay and spread over the entire molecule within 10 fs, leading to Coulomb explosion. The measured momentum distributions and correlations are well reproduced by the model calculations. The results for electron spectroscopy on argon and xenon clusters, with help of model calculations, illustrate that nanoplasma is formed by the XFEL pulse in tens of fs, and continuous thermal emission from the plasma occurs in ps.

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