The photoabsorption spectrum of an indium laser produced plasma

Abstract

The photoabsorption spectrum of In II has been recorded in the 18-33 eV region using the dual laser plasma (DLP) technique. Transitions from the 4d105s2 ground state dominate the In II spectrum with some contribution from the metastable 3P2, 3P1 and 3P0 levels of the excited 4d105s5p configuration also observed. Transitions were identified by comparison with values obtained from multiconfiguration Hartree-Fock calculations.

Comparative studies of resonance enhancement of harmonic radiation in indium plasma using multicycle and few-cycle pulses

“…where the fitting parameters a 0 , a 1 , a 2 , a 3 are chosen to reproduce some properties of In II. Namely, as it was mentioned above, the 19.92-eV ion transition 4d 10 5s 2 1 S 0 → 4d 9 5s 2 5p ( 2 D) 1 P 1 from the ground state to an AIS has a frequency close to that of the 13th harmonic frequency of the 800-nm radiation, and an oscillator strength that substantially exceeds those of the neighboring transitions in the spectral region considered [43]. Thus, it is appropriate to neglect other excited states for this ion and to choose the potential parameters a 0 = 0.65, a 1 = 1.0, a 2 = 3.8, and a 3 = 1.6 to reproduce the energies of the ground state and AIS, the AIS width, and the transition oscillator strength.…”

Harmonic generation from partially ionized plasma [Invited]

“…7), the emission spectrum was dominated by a peak at ≈18 eV, which we identify as the overlap of H11 (photon energy ≈ 17 eV) with the 18.3 eV Zn III transition 3d 10 → 3d 9 2 D4p, which has an oscillator strength significantly greater than other lines in this spectral region [86]. For In, an enhanced feature close to 20 eV is observed, which we attribute to the overlap of H13 (photon energy ≈ 20 eV) with the 19.9 eV ground to autoionising state transition in In (4d 10 5s 21 S 0 → 4d 9 5s 2 5p 2 D 1 P 1 ), which has an oscillator strength ≈10× larger than other transitions [87].…”

Endohedral fullerenes: A way to control resonant high-order harmonic generation

“…Using the indium laser ablation, the enhancement of the 13th harmonic at the wavelength of 61.26 nm has been reported [30]. The 4d 10 5s 21 S 0 -4d 9 5s 2 5p( 2 D) 1 P 1 transition of In II at the wavelength of 62.2 nm, which has an oscillator strength (gf value) of 1.11 [25], can be driven into the resonance with the 13th harmonic by the ac-Stark shift. The gf value of this transition is 10 times higher compared with the other transitions of In II in this spectral range.…”

“…1. There are signs of separate resonant peaks whose experimental observations were previously attributed to strong transitions in indium and antimony [25,26]. This might be because the C 60 shell does not prevent the corresponding dipole excitations of implanted atoms.…”