Four-photon excitation of even-parity Rydberg states in krypton and xenon

Modification of multiphoton ionization spectra via third harmonic generation in focused laser beams

“…This behaviour is consistent with a two photon ionization scheme involving a THG photon as discussed for the case of Kr. This is also in agreement with the earlier observations [9] and the spectra at low pressures.…”

“…The lack of the 5d[1/211 resonance in the 3 + 1 REMPI spectrum at low pressures has been noticed also in previous experiments [8]. On the contrary, a very strong peak at wavelengths corresponding to this double resonance has been reported in REMPI spectra taken in a cell at higher Xe pressures [9]. This extreme case of the appearance of a strongly enhanced ionization peak only at high pressures, while in the low pressure regime there is no observable ionization signal, can again be attributed to the THG in the vicinity of the 5 d(1/2] 1 state.…”

Resonance-enhanced photon excitation spectroscopy of the even-parity autoionizing Rydberg states of Kr

“…Dunning and Stebbing [17] obtained Kr atoms in the two metastable states produced by electron impact, then observed for the first time the excitation spectrum from the metastable states to some even-parity 4p 5 np' [1/2] 1 and 4p 5 nf' [5/2] 3 autoionizing resonances. Subsequently, there were some papers reported partly even-parity autoionizing resonances excited by VUV laser multiphoton or synchronization radiation [4,[18][19][20] .…”

Dependence of Photodarkening on Alloy Composition of CdSxSe1-x Nanocrystals in Glasses

“…Previous spectroscopic work on the Rydberg states in Xe below the 5p 5 3/2 or 5p 5 1/2 thresholds, as accessed from the Xe 5p 6 1 S 0 ground state, includes one-photon excitation of the odd parity ns J = 1 and nd J = 1 states [2,20,[25][26][27][28][29][30][31][32] and multiphoton excitation of odd or even Rydberg states by non-resonant [19,[33][34][35][36][37] or resonant [38,39] multiphoton excitation. In addition, single-photon [40][41][42][43][44][45][46] or resonant as well as non-resonant two-photon [8,[47][48][49][50] excitation from either of the two metastable levels of Xe have been exploited to investigate even and odd Rydberg states, respectively.…”