High-resolution vibrational predissociation spectroscopy of I-·H2O by single-mode CW infrared excitation in a 3D cryogenic ion trap

Harville, Payten Anne; Edington, Sean; Moss, Olivia; Huang, Meng; McCoy, Anne; Johnson, Mark Albert

doi:10.1080/00268976.2023.2174784

Title: High-resolution vibrational predissociation spectroscopy of I^-·H₂O by single-mode CW infrared excitation in a 3D cryogenic ion trap

Journal Article · 13 February 2023 · Molecular Physics

DOI: https://doi.org/10.1080/00268976.2023.2174784 · OSTI ID:1914098

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Yale Univ., New Haven, CT (United States); Yale University
Yale Univ., New Haven, CT (United States)
Emory Univ., Atlanta, GA (United States)
Univ. of Washington, Seattle, WA (United States). Dept. of Chemistry

We describe the integration of a tunable, single-mode, continuous wave infrared laser into a cryogenic ion spectroscopy experiment to measure the rovibrational spectrum of the I^-∙H₂O complex in the OH stretching region. These upper levels lie about 300 cm^-1 above the dissociation threshold. The measurements are carried out by loading the ions in a radiofrequency ion trap at 10 Hz and cooling them to 5 K with pulsed He buffer gas. IR photodissociation (PD) of the I^-∙H₂O complex is monitored by recording the I^- product yield by time-of-flight mass spectrometry as a function of laser wavelength. Very narrow (Δν~75 MHz) rotational lines are observed throughout the spectrum, indicating long (ca. 2 ns) lifetimes for the excited metastable rovibrational levels. Rotational analysis of the band arising from the K”=1 to K’=2 transition of the free OH stretching fundamental yields the structure of the complex for the first time. Over 50% of the trapped ion ensemble in the trap can be photodissociated upon excitation of a single rotational line. This enables very high signal-to-noise in the PD spectrum, and is traced to a mechanism in which the ground state rotational levels are rapidly equilibrated by collisions with the buffer gas.

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Research Organization:: Yale Univ., New Haven, CT (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0021012

OSTI ID:: 1914098

Journal Information:: Molecular Physics, Journal Name: Molecular Physics Journal Issue: 1-2 Vol. 122; ISSN 0026-8976

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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74 ATOMIC AND MOLECULAR PHYSICS
rovibrational spectroscopy
cluster spectroscopy
rotational constant
tunable laser
ion trap

Title: High-resolution vibrational predissociation spectroscopy of I-·H2O by single-mode CW infrared excitation in a 3D cryogenic ion trap

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Title: High-resolution vibrational predissociation spectroscopy of I^-·H₂O by single-mode CW infrared excitation in a 3D cryogenic ion trap