X-ray emission from hollow atoms produced by collisions of 
multiply charged ions with a solid

Moribayashi, Kengo; Suto, Keiko; Zhidkov, A.; Sasaki, Akira; Kagawa, T.

doi:10.1017/s0263034601194115

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…It means that such plasma hollow ions will be created independently on the ion pulse duration (see for example, Moribayashi et al, 2001a). The ion energy for effective ionization of inner atom electrons must be higher than the energy of fast electrons, of course, but the experiments, carried out at the different accelerators, showed that energy of nowadays used heavy projectile ions are enough for ionization of the K-electrons in the different atoms (see, for example, MacFarlane et al, 1993;Rosmej et al, 2002;Rosmej, O. et al, 2003;2005b;2005a;Pikuz et al, 2006;Rzadkiewicz et al, 2010;Kawamura et al, 2011;McMahon et al, 2011;Nakano et al, 2012).…”

Section: Emission Of Hollow Ions Spectra In High-temperature Plasma Wmentioning

confidence: 99%

Diagnostics of warm dense matter by high-resolution X-ray spectroscopy of hollow ions

et al. 2014

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The short review on the possible applications of the hollow ion spectra for the diagnostics of the high-temperature plasma created by intensive laser and particle beams is presented. Because of the hollow ion spectra features are defined mainly by the mechanisms of their excitation, we consider the various types of the high-temperature plasma where different excitation processes are important. It is shown that like ordinary spectral lines, spectra of the hollow ions offer considerable diagnostic opportunities. At the present time, hollow ion spectra are used mainly to investigate plasma heated by X-ray radiation, but the hollow ions must be generated when plasma is heated by fast heavy ion beams too. In this case, the resultant substance state will be also characterized by solid-state density, and some spatial regions of targets will have relatively low temperatures, i.e., will be a nonideal plasma. It is emphasized that hollow ion spectra are promising diagnostic tool for both nonideal plasma and warm dense matter.

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Section: Emission Of Hollow Ions Spectra In High-temperature Plasma Wmentioning

confidence: 99%

Diagnostics of warm dense matter by high-resolution X-ray spectroscopy of hollow ions

et al. 2014

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“…multiple vacancies in the K or L shells. Experimentally, such exotic states have been produced from interactions of highly charged ions and laser beams with solids [6][7][8][9][10][11], collisions in cluster targets [2], gaseous targets [12] and even using synchrotron radiation [13][14][15][16]. Recently, [17][18][19][20] the formation of hollow atoms has been studied using intense short-pulse lasers incident on cluster targets.…”

Section: Introductionmentioning

confidence: 99%

MUTA calculations of a laser-produced Mg hollow atom spectrum

et al. 2008

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A study is made of the spectra produced from a short-wavelength long-pulse (nanosecond) laser incident on a Mg plasma. A very complex experimental spectrum is analyzed in detail by comparison with large-scale atomic kinetics calculations using the recently developed mixed-UTA (MUTA) model. We find that the experimental spectrum appears to contain lines from many inner-shell transitions from ions ranging from neutral Mg to Li-like Mg. Lines from transitions such as 1s-3l, 1s-4l, and from hollow atoms (where in this context hollow atoms refer to ions with an empty 1s shell) are observed. The inclusion of very small fractions of hot electrons is demonstrated to make significant differences to the spectra. Although it is found that the calculations do not match perfectly the experimental spectra, reasonable agreement between the experiment and the theory can be obtained if temperature and density gradients are assumed present in the experimental conditions.

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“…Other important experimental studies of hollow ion formation have also been carried out at GSI . Laser-plasma interactions probing production of multicharged accelerated ions or warm dense matter have also been studied extensively (see for example, Cao et al, 2007;Batani et al, 2007;Nickles et al, 2007;Faenov et al, 2007;Kado et al, 2006). Experiments at JAEA have probed Ar clusters for hollow atom production, and other studies have been done on laser absorption mechanisms in clusters (Kanapathipillai, 2006).…”

Section: Introductionmentioning

confidence: 99%

The role of hollow atoms in the spectra of an ultrashort-pulse-laser-driven Ar cluster target

et al. 2008

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An investigation is made of the role of hollow atoms in the spectra of an ultrashort-pulse-laser-driven Ar cluster target. Experimental measurements are presented from an Ar cluster-gas target using short-pulse lasers with various intensities, durations, and contrasts. Calculations in support of these measurements have been performed using a detailed atomic kinetics model with the ion distributions found from solution of the time-dependent rate equations. The calculations are in good agreement with the measurements and the role of hollow atoms in the resulting complicated spectra is analyzed. It is demonstrated that, although the presence of hollow atoms is estimated to add only around 2% to the total line emission, signatures of hollow atom spectra can be identified in the calculations, which are qualitatively supported by the experimental measurements.

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X-ray emission from hollow atoms produced by collisions of multiply charged ions with a solid

Cited by 4 publications

References 11 publications

Diagnostics of warm dense matter by high-resolution X-ray spectroscopy of hollow ions

Diagnostics of warm dense matter by high-resolution X-ray spectroscopy of hollow ions

MUTA calculations of a laser-produced Mg hollow atom spectrum

The role of hollow atoms in the spectra of an ultrashort-pulse-laser-driven Ar cluster target

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