E. Hegazi

Fluorescence and excitation spectra of the DO+, E1, and G1 states of the HgZn exciplex

Abstract The high-lying DO + , E1, and G1 spin—orbit states of the HgZn exciplex were excited by pump and probe laser irradiation of a HgZn vapor mixture in a quartz cell. The decays of these states gave rise to UV bound—free and visible bound—bound fluorescence spectra which were recorded with a monochromator, and scans of the probe dye laser produced excitation spectra in the region 4000–4600 A. Four new spectra were recorded and analyzed, yielding molecular constants for the various states. The new data also led to improved assignments of some previously reported HgZn spectra.

Laser spectroscopy of some high-lying HgZn spin—orbit states

Abstract Pump and probe methods of laser spectroscopy were employed to excite several high-lying spin—orbit states of the HgZn exciplex. Their decays to lower bound vibronic states produced fluorescence spectra which were recorded with a monochromator in the region 4100–5200 A, and scans of the probe dye laser produced the corresponding excitation spectra. Six new spectra were recorded and analyzed, yielding molecular constants for the various states. The new data, together with a more recent version of the PE diagram, also led to improved assignments of some previously reported spectra.

Laser‐induced fluorescence of the HgZn excimer: The 460 nm band

The 460 nm HgZn fluorescence band was excited by pumping a Hg‐Zn vapor mixture in a quartz cell with 307.59 nm laser pulses which populated the 43P1 Zn atomic state. The excited HgZn molecules were formed by collisions of the 43P1 Zn atoms with ground‐state Hg atoms. The resulting HgZn fluorescent band centered near 460 nm had a half‐width of about 80 nm and contained an additional component near 500 nm.

Emission and absorption spectra of the HgZn excimer

Extensive and previously unknown fluorescence and excitation spectra of the HgZn excimer have been observed and correlated with a potential energy (PE) diagram. The spectra were excited in a HgZn mixture contained in a quartz vapor cell by successive pulses from two dye lasers using pump‐and‐probe methods. A vibrational analysis of the spectra yield the frequencies and anharmonicities for the states involved in the absorption and emission processes.

Excited-state LIF Spectroscopy of Hg and Zn Molecules - The Path to New Excimer Lasers?

Publisher Summary There has been a revival of interest in the spectroscopy of Group 2b excimers because of the possibility of laser action in the blue-green spectral region. In the past, various attempts to produce laser action in Hg2 have been unsuccessful because of excited-state absorption from either the upper laser-level or meta stable levels in equilibrium with it. The spectroscopy of the Hg2 excimer has been investigated systematically during recent years using pump method and probe method, and numerous bound excited states and transitions between pump method and probe method have been identified. Analysis of vibrational structures of the fluorescence and excitation bands yielded vibrational frequencies, anharmonicities, energy separations between the electronic states, and relative equilibrium inter nuclear separations. Recent high-resolution laser-spectroscopic studies of mono isotopic Hg 2 produced partial resolution of the rotational structure. Some non-linearity in the line-separations is due to the mode structure of the probe-laser output.