D. Gruber

Nonlinear emission in sodium vapour upon pulsed-laser excitation of the 42P levels

Parametric four-wave mixing, stimulated electronic Raman scattering and amplified spontaneous emission cascades have been studied experimentally by single-photon resonant and near-resonant excitation of the 42P levels of dense sodium vapour. The dependence of emission intensities on laser detuning and exciting laser power is discussed.

Production of the electronically excited NaCd excimer via resonant excitation of the metastable Cd(5p 3P1) level

We report the first evidence for the production of the electronically excited NaCd excimer following resonant excitation of the metastable Cd(5p 3P1) state. Dependence of intensity of emission from NaCd upon buffer gas pressure, temperature, and exciting laser wavelength is discussed and possible production mechanisms are proposed.

Laser driven channels of reactive collisions in Na plus Cd vapors

Abstract We report the observation of reactive collisions involving laser excited metastable 5p 3 P 1 Cd atoms and ground state Na 2 molecules. As result of these collisions the NaCd intermetallic excimer is formed in a bound excited electronic state and its typical bound-free emission to the ground state is detected. Experimental comparison of this new collision channel with the photochemical production of NaCd in collisions between electronically excited Na 2 and ground state Cd atoms is presented.

The LiHg X2Σ+→22II32 transition: excitation spectrum and rotational analysis of the v″ = 0−v′ = 1 band

Abstract We report the rotationally-resolved excitation spectrum of the LiHg X 2 Σ + →2 2 II 3 2 transition, the first case among Ia(Li, Na, K, Cs)-IIb(Zn, Cd, Hg) intermetallic molecules. Different vibronic transitions are assinged. A rotational analysis is made for the v″ = 0 → v′ = 1 band, and rotational constants have been obtained.

Theoretical analysis of the emission spectra of the NaCd excimer

We present simulations of bound–bound and bound–free emissions of the NaCd* excimer, along with new experimental results concerning the red band system. The simulations, based on ab initio potential energy curves, confirm that the initial states are 2 2Σ+ for the red emission and 2 2Π for the blue emission of NaCd*. The two main peaks in the blue band system are due to spin–orbit splitting. The band shape obtained in the simulations is extremely variable, depending on the population distribution of the vibrational states of NaCd*. The comparison of simulated and measured spectra leads us to conclude that, in the experimental conditions adopted here and in previous work, the thermal equilibration of the excimer is far from complete.

Collision-induced fluorescence of Cs2: the 3 1Σu+ → X1Σg+ system

Abstract We report the observation of a band system between 510 and 540 nm in laser induced fluorescence spectra of Cs 2 excited by Ar + laser lines λ exc = 488 nm, λ exc 496.5 nm and λ exc = 501.7 nm. Using potential energy curves of Cs 2 and performing quantum mechanical simulations of the spectra we assign these new structures to the transition 3 1 Σ u + → 1 1 Σ g + .

The LiHg X2Σ+→22Π3/2 transition: Rotational analysis and potential curves

We present the rotationally-resolved excitation spectrum of the LiHg X2Σ+→22Π3/2 transition. Different vibronic transitions are assigned. Rotational analysis is made for υ′=1←υ′′=0, υ′=0←υ′′=0, 1, 2 vibronic bands and molecular constants are obtained. Based on the Inverted Perturbation Approach (IPA), the potential curves of the excited and ground electronic states are calculated.