Spectroscopic studies of the jet-cooled aluminum trimer

Abstract

Gas phase spectroscopic investigations of the jet-cooled aluminum trimer are reported using the technique of resonant two-photon ionization with mass spectrometric detection. A discrete band system in the 5200–6100 Å region is observed, consisting of an extended vibrational progression in a single vibrational mode. In addition, an apparent continuum absorption is observed which gradually grows in toward shorter wavelengths. The apparent continuum exhibits a long lifetime, 24–35 μs, which is most unusual and indicates that the continuum arises from spectral congestion and not lifetime broadening. At 19 378 cm−1 both the discrete and the continuum absorptions terminate abruptly, indicating the onset of dissociation above this energy. Although it is not certain that dissociation above this energy leads to ground electronic state Al2, this measurement nevertheless places an upper limit on D0(Al2–Al) of 2.40 eV.

Laser photoionization and spectroscopy of gas phase silver clusters

“…Gas phase vibronic spectra such as this have only been observed for a limited number of metal trimer systems (e.g. Na3 [29], Cu3 [30], A13 [35] and Ni3 [36]). Therefore, it is useful to consider what information can be obtained from this spectrum about the structure of the smallest silver cluster.…”

Spectroscopy of jet-cooled YCu

“…4 In the present study, production of the diatomic species was accomplished by pulsed laser ablation ͑Nd:YAG, 532 nm, 20 mJ/pulse͒ of an equimolar YCu alloy disk, which was rotated and translated on a cam assembly to prevent the pulsed Nd:YAG laser from drilling holes in the sample, and to continually present a fresh surface for ablation. The metal plasma was entrained in helium carrier gas, which was pulsed over the metal target surface from a reservoir pressure of 120 psi.…”

Radiative Lifetime of thev = 0, 1 Levels of the \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr}

“…The lifetime measurement was performed by the timedelayed resonant two-photon ionization technique, using an instrument that has been previously described ( Fu et al 1988). Diatomic CrH was produced by pulsed laser ablation (Nd:YAG, 532 nm, 10 mJ pulse À1 ) of a chromium disk (Alfa Aesar, 99%) in a flow of helium containing 3% CH 4 .…”