J. Supronowicz

Laser spectroscopy of the 1Σ+u (4 1P) and 3Πu (4 3P) states in Zn2

Abstract The 0 + u (4 1 P) state of Zn 2 was excited near the crossing of the 1 Σ + u (4 1 P) and 3 Π u (4 3 P) states, using pump and probe methods with time resolution. A structured excitation spectrum was observed in the 530–570 nm region and is ascribed to the 3 Π u (4 3 P)← 3 Π g (4 3 P) vibronic transitions. A fluorescence spectrum which was emitted in the 250–306 nm region is believed to arise from the 1 Σ + u →X 1 Σ + g bound—free decay. It consists of a “Condon internal diffraction pattern” whose profile suggests that it was emitted from a high vibrational level ( v ′ = 19) of the 1 Σ + u state.

The rotationally resolved G0+u ← A0+g electronic spectrum of the (202Hg)2 excimer

Abstract Isotopically pure 202 Hg vapor, contained in a quartz cell, was irradiated with frequency-doubled 5140 A output from an Ar + laser, which caused the formation of Hg 2 A0 ± g excimer molecules by photoassociation. Simultaneous probe radiation from a ring dye laser scanned over a range 5400–6000 A, produced the G0 + u ← A0 + g excitation spectrum which consists of several hundred well-resolved rotational components that have not been previously observed. Two vibronic bands were subjected to a rotational analysis which yielded spectroscopic constants that are compared with some previously reported values.

Laser-induced 1Σ+u ← 3Πg excitation spectrum of Zn2

Abstract A structured excitation spectrum of Zn2 in the 420–470 nm region was registered in zinc vapor subjected to pump-and-probe excitation as the emitted bound—free fluorescence was monitored at 274 nm. The excitation and fluorescence spectra were interpreted as due to transitions involving the 1Σ+u (5 1S), 3Πg (4 3P), and X1Σ+g (4 1S0) states. An analysis of the vibrational structure yielded vibrational constants and relative energies for the 1Σ+u and 3Πg states.

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.

Improved analysis of the G Ou+ from A Og+ LIF band in Hg2

More extensive and much more precise spectroscopic data on the excitation of the G Ou+ state have led to an extended and improved analysis of the G Ou+ from A Og+ excitation band, yielding corrected assignments of vibrational components and revised values omega e=88 cm-1, omega ex epsilon =0.28 cm-1 for the G Ou+ state which supersede those published recently.

Mixing of the Cd 5 3P fine-structure states by Hg collisions

Abstract 5 3 P fine-structure mixing in Cd, induced in collisions in ground-state Hg atoms, was investigates by methods of LlF with time resolution. A quartz vapor-cell containing an HgCd mixture was irradiated with consecutive pump and probe laser pulses. The pump pulses (326.1 nm) produced a population of Cd 5 3 P 1 atoms whose collisions with Hg atoms caused the distribution of population among the 3 P fs states. These were probed with laser radiation exciting the 6 3 S 1 state which emitted fluorescence whose relative intensity was recorded in relation to the pum—probe delay, reflecting the time evolution of the respective 3 P J populations. The experiments which were carried out over a range of temperatures and CdHg densities, yielded the cross sections for the fs mixing collisions and the rate constant for the HgCd exciplex formation.

Inelastic collisions of Cd3P1 atoms in an Hg‐Cd vapor mixture

Inelastic collisions of Cd 53P1 atoms with ground‐state Hg atoms were investigated by methods of LIF with time resolution. The experiments yielded the cross sections for mixing among the Cd 53P fs states and the rate constant for HgCd exciplex formation.

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.