# Laser-induced Fluoresence of Linear-Chain Molecular Ions in Neon Matrices

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 Title: Laser-induced Fluoresence of Linear-Chain Molecular Ions in Neon Matrices Creators: Smith, A. M.; Agreiter, Jurgen; Bondybey, V. E. Issue Date: 1995 Publisher: Ohio State University Abstract: The $\tilde{A}^{2}\Pi \leftrightarrow \tilde{X}^{2}\Pi$ transitions of the ions $H-(C\equiv C)_{n}-H^{+} (n=3-5)^{a}, H-(C\equiv C)_{n}-C\equiv N^{+} (n=2-3)^{b}$, and $N \equiv C^{-}(C\equiv C)_{n}-C\equiv N^{+} (n=1-3)^{c-d}$ are studied in neon matrices through Fourier-transform absorption, emission and laser excitation spectroscopies. The ions are produced from simple precursors diluted in neon using a source combining a self-igniting discharge with a pulsed supersonic expansion recently developed in our laboratory. For each of the three ion families, the red shift of the $\tilde{A}^{2}\Pi \leftrightarrow \tilde{X}^{2}\Pi$ transition with increasing chain length is quite accurately predicted by a one-dimensional particle in a box model. Stretching vibrational information for both the ground and excited states is extracted from the very sharp and well-resolved spectra. As clearly seen in our three-dimensional (emission, excitation, emission intensity) spectra, these linear-chain ions all show subsidiary emission/excitation bands for the bluer of the two discrete sites, which are best interpreted as due to the nominally forbidden ${^{2}}\Pi_{\frac{1}{2}} \leftrightarrow {^{2}}\Pi_{\frac{3}{2}}$ transitions. Description: $^{a}$A.M. Smith, J. Agreiter, M. Hartle, C. Engel and V.E. Bondybey, Chem. Phys., 189, 315 (1994). $^{b}$A.M. Smith, J. Agreiter and V.E. Bondybey, J. Mol. Spec., Feb. 1995, submitted. $^{c}$J. Agreiter, A.M. Smith, M. Hartle and V.E. Bondybey, Chem. Phys. Lett., 225, 87 (1994). $^{d}$J. Agreiter, A.M. Smith, and V.E. Bondybey, Chem. Phys. Lett., Feb. 1995, submitted. Author Institution: Technische Universität München, Lichtenbergstraße 4, D-85748 Garching, Deutschland URI: http://hdl.handle.net/1811/29755 Other Identifiers: 1995-TC-01