High-resolution Infrared Spectra Of The Oh-stretching Bands Of Protonated Water Dimer, H5o2+

Salomon, Thomas

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https://hdl.handle.net/2142/116806 Copy

Description

Title

High-resolution Infrared Spectra Of The Oh-stretching Bands Of Protonated Water Dimer, H5o2+

Author(s)

Salomon, Thomas

Contributor(s)

• Schlemmer, Stephan
• Markus, Charles R.
• Asvany, Oskar

Issue Date

2022-06-22

Keyword(s)

Ions

Abstract

We present high-resolution infrared action spectra of cold H$_5$O$_2^+$. For this purpose the mass selected parent ions are stored in a cryogenically cooled 22-pole ion-trap (COLtrap). There we employ a two-color-photodissociation scheme where first the symmetric or the anti-symmetric O-H-stretching band is excited by a narrow linewidth cw-OPO. Then, Light from a CO$_2$ laser is used to efficiently dissociate the parent molecule. The infrared-absorption of the parent ion is recorded by the appearance of H$_3$O$^+$ photoproducts. This procedure follows the seminal approach first invented in the group of Y.T. Lee~$^{a,b}$. The rotationally resolved and basically background-free spectrum exhibits a complex structure, making the assignment of individual ro-vibrational tunneling features challenging. Nonetheless, recurring spectral spacings are used to start to unfold the rotational/tunneling structure. Moreover, spectral indicators are found that support the assumption of hydrazine-like tunnelling dynamics being present in this peculiar molecule of fundamental interest. \\ \\ \textit{$^{a}$ L. I. Yeh, M. Okumura, J. D. Myers, J. M. Price, and Y. T. Lee , Vibrational spectroscopy of the hydrated hydronium cluster ions H$_{3}$O$^{+}$(H$_2$O)$_{n}$ (n=1,2,3), J. Chem. Phys. 91, 7319-7330 (1989)} \\ \\ \textit{$^{b}$ L. I. Yeh, Y. T. Lee, and J. T. Hougen. Vibration-rotation spectroscopy of the hydrated hydronium ions H$_5$O$_2^+$ and H$_9$O$_4^+$. Journal of Molecular Spectroscopy 164.2 (1994): 473-488.}

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116806

DOI

https://doi.org/10.15278/isms.2022.WG07

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Copyright 2022 held by the authors

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