Novel pathways to the assignment of the third rare gas excimer continua

Wieser, J.; Ulrich, A.; Fedenev, Andrei V.; Salvermoser, M.

doi:10.1016/s0030-4018(99)00610-0

Cited by 27 publications

(38 citation statements)

References 26 publications

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“…These emission features could be the third excimer continuum emitted in decays of highly charged ionic excimer molecules, which are found to be very fast already in the gas phase [50].…”

Section: Time-resolved Studiesmentioning

confidence: 99%

Ion-beam excitation of liquid argon

et al. 2013

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The scintillation light of liquid argon has been recorded wavelength and time resolved with very good statistics in a wavelength interval ranging from 118 nm through 970 nm. Three different ion beams, protons, sulfur ions and gold ions, were used to excite liquid argon. Only minor differences were observed in the wavelengthspectra obtained with the different incident particles. Light emission in the wavelength range of the third excimer continuum was found to be strongly suppressed in the liquid phase. In time-resolved measurements, the time structure of the scintillation light can be directly attributed to wavelength in our studies, as no wavelength shifter has been used. These measurements confirm that the singlet-to-triplet intensity ratio in the second excimer continuum range is a useful parameter for particle discrimination, which can also be employed in wavelength-integrated measurements as long as the sensitivity of the detector system does not rise steeply for wavelengths longer than 190 nm. Using our values for the singlet-to-triplet ratio down to low energies deposited a discrimination threshold between incident protons and sulfur ions as low as ∼2.5 keV seems possible, which represents the principle limit for the discrimination of these two species in liquid argon.

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“…These emission features could be the third excimer continuum emitted in decays of highly charged ionic excimer molecules, which are found to be very fast already in the gas phase [50].…”

Section: Time-resolved Studiesmentioning

confidence: 99%

Ion-beam excitation of liquid argon

et al. 2013

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“…4, there are two maxima of gain at 230 and 244 nm, which resemble the peaks 225 and 245 nm in Wieser et al (2000). However in Wieser et al (2000) the ion beam is used as pumping source and its duration is very small (2 ns). For the complexity of the continuum, it is difficult to compare their results with our results.…”

Section: Observation On Resonator Effectsmentioning

confidence: 99%

“…In the third continuum, the spectrum between 200 and 300 nm can only be interpreted by the transition of Ar 2 +* ionic excimer (Cachoncinlle et al 1992b). Furthermore, Wieser et al (2000) found three emission maxima between 200 and 300 nm and proposed that the emission at 212 and 225 nm originate from transition of Ar 2 +* and the emission at 245 nm originate from transition of Ar 3 +* . In a word, there are different hypothesis on the origination of the spectrum between 200 and 300 nm.…”

Section: Introductionmentioning

confidence: 99%

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Resonator effects of Ar2+ ionic excimer pumped by electron beam

2005

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The third continuum of argon from 200 to 270 nm is obtained by electron beam pumping argon. With the front mirror and the rear mirror, the resonator effects are observed at 240 and 220 nm. Compared with the intensity of fluorescence, the intensity near 240 nm increases more than 10 times when the resonator is formed. In order to explain the origin of the continuum, the kinetic model on Ar 2 + and Ar 2 2+ ionic excimers pumped by electron beam is built and calculated. Based on the theoretical results, the Ar 2 + ionic excimer should be responsible for the continuum around 240 nm.

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“…However, none of these features has been interpreted in terms of RCT. In other noble gases, mostly in Ar, emissions in the ultraviolet spectral range have been attributed to charge transfer processes in ion-atom collisions [25][26][27][28][29]. Recently [30][31][32], fluorescence detection has been successfully introduced as a tool to identify and characterize interatomic processes in clusters.…”

Section: Introductionmentioning

confidence: 99%

Direct evidence for radiative charge transfer after inner-shell excitation and ionization of large clusters

et al. 2018

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We directly observe radiative charge transfer (RCT) in Ne clusters by dispersed vacuum-ultraviolet photon detection. The doubly ionized Ne 2+ -Ne n 1 -initial states of RCT are populated after resonant 1s-3p photoexcitation or 1s photoionization of Ne n clusters with n 2800 á ñ » . These states relax further producing Ne + -Ne + -Ne n 2 -final states, and the RCT photon is emitted. Ab initio calculations assign the observed RCT signal to the Ne 2p D Ne ninitial state, while transitions from other possible initial states are proposed to be quenched by competing relaxation processes. The present results are in agreement with the commonly discussed scenario, where the doubly ionized atom in a noble gas cluster forms a dimer which dissipates its vibrational energy on a picosecond timescale. Our study complements the picture of the RCT process in weakly bound clusters, providing information which is inaccessible by charged particle detection techniques.

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Novel pathways to the assignment of the third rare gas excimer continua

Cited by 27 publications

References 26 publications

Ion-beam excitation of liquid argon

Ion-beam excitation of liquid argon

Resonator effects of Ar2+ ionic excimer pumped by electron beam

Direct evidence for radiative charge transfer after inner-shell excitation and ionization of large clusters

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