Exciplex vacuum ultraviolet emission spectra of KrAr: Temperature dependence and potentials

Abstract

The temperature dependence of the emissions from the 0 ϩ ( 3 P 1 )and 1( 3 P 2 ) Kr*Ar exciplex states in the range 85-350 K was studied using time resolved techniques, vacuum ultraviolet synchrotron radiation, and argon samples doped with minimal amounts of krypton. As the temperature is increased, the emission shifts to the blue, its width increases by almost a factor of 2, and the line shape becomes asymmetrical. The experimental line shapes have been simulated by means of Franck-Condon density calculations using the available ground state potential of Aziz and Slaman ͓Mol. Phys. 58, 679 ͑1986͔͒ and by modeling the exciplex potentials as Morse curves. The potential parameters for the 0 ϩ and 1 states are r e ϭ 5.05 Ϯ 0.01 and 5.07Ϯ0.01 a 0 , respectively; D e ϭ 1150 Ϯ 200 cm Ϫ1 and ␤ϭ1.4Ϯ0.1 a 0Ϫ1 for both states. The latter two values yield e ϭ 140 cm Ϫ1 and e x e ϭ 4.3 cm Ϫ1 . The energy positions of the exciplexes's wells and their depths are compared with published results.

Accurate Estimation of Carotid Luminal Surface Roughness Using Ultrasonic Radio-Frequency Echo

“…The potential well of the Kr * Ar exciplex is very shallow (D e = 1150 ± 200 cm −1 ) as reported by Subtil et al [16].…”

“…They attributed the band to the emission of heavy clusters, liquid drops and microcrystals created by expansion in a vacuum and excited by an electron beam. The estimated width of the ArKr exciplex band seen in this experiment is approximately 4000 cm −1 which corresponds to a temperature of 150 K [16].…”

“…Spectra of the Kr * Ar exciplex have been reported before for synchrotron radiation excitation by Laporte et al [14,15] and Subtil et al [16]. The molecular potential of the system was calculated recently by Spiegelmann et al [17].…”

Excimer emission spectra of rare gas mixtures using either a supersonic expansion or a heavy-ion-beam excitation

“…The optimum concentration for Kr * 2 emission due to energy transfer is about 1.1%. The potential well of the Kr * Ar exciplex is very shallow (D e = 1150 ± 200 cm −1 ) as reported by Subtil et al [16].…”

“…(iii) An explicit ArKr * broad-band emission spectrum centred around 135.0 nm. Spectra of the Kr * Ar exciplex have been reported before for synchrotron radiation excitation by Laporte et al [14,15] and Subtil et al [16]. The molecular potential of the system was calculated recently by Spiegelmann et al [17].…”