Laser spectroscopy in a pulsed jet of AlH: Ionization-detected ultraviolet absorption spectra of the transitions C 1Σ+-X 1Σ+ and b 3Σ--X 1Σ+

Article abstract of DOI:10.1063/1.463192

We report the production of radical transients AlH and AlD in a filament-source pulsed free-jet expansion.In this source, hydrogen gas from a pulsed value passes over hot tungsten filament wrapped by a layer of aluminum wire.Liquid aluminum wetting the filament reacts rapidly to form (AlH3)x oligomer.Depending of filament temperature, either AlH or AlH2 sublimes from this oligomeric coating to be entrained in subsequent pulses of H2.The source has been characterized by laser induced fluorescence and ionization-detected one-photon absorption with time-of-flight massresolution.Laser-induced fluorescence measurements focus on the well-known A-X transition of AlH.Higher energy ionization-detected absorption spectra resolve the C ¹Σ⁺-X ¹Σ⁺ transition in AlH and AlD, and for the first time the forbidden transition, b ³Σ^--X ¹Σ⁺, in AlH.Spectroscopic constants determined from an analysis of bands assigned to v = 0 and v = 1 of the b ³Σ^- state are T_e = 40 524 cm^-1, B_e = 7.0675 cm^-1, D_e = 6.1 * 10^-5 cm^-1, α_e = 0.637 cm^-1, β_e = 6.38 * 10^-4, and γ_e = 1.5725, with v = 0 spin-orbit and spin-rotation coupling parameters λ₀ = 0.29 cm^-1, and γ₀ = 0.03 cm^-1, inducing structure in a transition that appears to be predominantly parallel.For v = 1, spin-orbit coupling is much stronger, and rotational branch intensities suggest interference, indicating that both parallel and perpendicular components of the transition moment contribute to the total oscillator strength.Results for the C-X (0-0) transitions give B₀ = 6.3869 cm^-1 and D₀ = 5.329 * 10^-4 with T₀ = 44 594.05 cm^-1 for the AlH C state, and B₀ = 3.3457 cm^-1 and D₀ = 1.380 * 10^-4 cm^-1 with T₀ = 44 631.09 cm^-1 for the AlD C state.

Full text of DOI:10.1063/1.463192

Laser spectroscopy in a pulsed jet of AlH: Ionizationdetected ultraviolet absorption
spectra of the transitions C 1Σ+–X 1Σ+ and b 3Σ−–X 1Σ+
Yi Fei Zhu, Rana Shehadeh, and Edward R. Grant
Citation: The Journal of Chemical Physics 97, 883 (1992); doi: 10.1063/1.463192
View online: http://dx.doi.org/10.1063/1.463192
View Table of Contents: http://scitation.aip.org/content/aip/journal/jcp/97/2?ver=pdfcov
Published by the AIP Publishing
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