Laser-induced fluorescence spectroscopy of the Ga–N2 cluster

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DOI 10.1039/A901675I
Impact Factor 3.676
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Abstract

The first spectroscopic observation of the Ga–N2 van der Waals cluster is reported. This was formed by laser ablation of a GaAs or GaP target followed by pulsed supersonic expansion in pure nitrogen. Laser-induced fluorescence spectra have revealed two strong band systems above 30000 cm-1. The first, which has an onset at 33468 cm-1, is composed of eight observable members of a progression in the van der Waals stretching vibration. This has been assigned to the 2Δ–2Π3/2 transition correlating with the Ga 442Dâ�442P3/2 transition. A Birge–Sponer extrapolation gives a lower limit of 1270 cm-1 for the van der Waals binding energy in the excited state. At higher wavenumbers another prominent vibrational progression is observed which is attributed to a spin-forbidden transition correlating with the 444Pâ�442P atomic asymptote, the cluster excited state most likely having 4Σ- symmetry. The excited state undergoes relatively slow spin–orbit-induced predissociation onto the repulsive 2Σ+ potential surface followed by rapid emission from the Ga 452S dissociation product.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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