TY - JOUR
T1 - White X-ray pulse emission of alkali halide aqueous solutions irradiated by focused femtosecond laser pulses
T2 - A spectroscopic study on electron temperatures as functions of laser intensity, solute concentration, and solute atomic number
AU - Hatanaka, Koji
AU - Miura, Toshifumi
AU - Fukumura, Hiroshi
N1 - Funding Information:
This work is supported financially by the Grant-in-Aid (Scientific Research on Priority Areas) of the Ministry of Education, Science, and Technology (14077202). The authors are thankful to Prof. Yasuo Udagawa (IMRAM, Tohoku University), Prof. Masae Kikuchi (Tohoku Fukushi University), and Prof. Tsutomu Sekine (Department of Chemistry, Graduate School of Science, Tohoku University) for the uses of Ge solid-state detectors and a high voltage supplier, respectively.
PY - 2004/4/19
Y1 - 2004/4/19
N2 - Aqueous solutions of alkali halides were irradiated with focused femtosecond laser pulses (130 fs, 780 nm, 1 kHz) in air, and X-ray emission spectra were measured. The laser power density at the focus was estimated to be 2 PW/cm2 when the laser intensity was 0.65 mJ/pulse. Broad X-ray emission spectra having tails to the higher energy were commonly observed, often accompanied by characteristic K and L lines of solutes. Electron temperatures (Te) were obtained from the slopes of the broad X-ray spectra on the basis of the assumption of Maxwell-Boltzmann distribution of electron energy. The value of Te was 1.90 keV in the case of distilled water irradiated with laser pulses of 0.53 mJ/pulse laser pulses, while two components of Te (2.67 and 9.83 keV) were observed in the case of saturated cesium chloride aqueous solution (6.5 mol/dm3). These two components may be related to different electron acceleration processes such as inverse-bremsstrahlung and resonance absorption.
AB - Aqueous solutions of alkali halides were irradiated with focused femtosecond laser pulses (130 fs, 780 nm, 1 kHz) in air, and X-ray emission spectra were measured. The laser power density at the focus was estimated to be 2 PW/cm2 when the laser intensity was 0.65 mJ/pulse. Broad X-ray emission spectra having tails to the higher energy were commonly observed, often accompanied by characteristic K and L lines of solutes. Electron temperatures (Te) were obtained from the slopes of the broad X-ray spectra on the basis of the assumption of Maxwell-Boltzmann distribution of electron energy. The value of Te was 1.90 keV in the case of distilled water irradiated with laser pulses of 0.53 mJ/pulse laser pulses, while two components of Te (2.67 and 9.83 keV) were observed in the case of saturated cesium chloride aqueous solution (6.5 mol/dm3). These two components may be related to different electron acceleration processes such as inverse-bremsstrahlung and resonance absorption.
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U2 - 10.1016/j.chemphys.2003.10.036
DO - 10.1016/j.chemphys.2003.10.036
M3 - Article
AN - SCOPUS:1642295597
VL - 299
SP - 265
EP - 270
JO - Chemical Physics
JF - Chemical Physics
SN - 0301-0104
IS - 2-3
ER -