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Title:Sub-doppler Jet-cooled Infrared Spectroscopy Of Nd2h2+ And Nd3h+ In The Nh Stretch Fundamental Modes
Author(s):Chang, Chih-Hsuan
Contributor(s):Nesbitt, David
Abstract:Sub-Doppler jet-cooled rovibrational spectra of ND$_{3}$H$^{+}$, ND$_{2}$H$_{2}$$^{+}$, and NDH$_{3}$$^{+}$ ions in various fundamental NH modes were observed and analyzed using difference frequency generation infrared spectroscopy. The ions were generated in the concentration-modulation slit-jet expansion via a H$_{3}$$^{+}$ proton transfer mechanism in a discharge mixture of ND$_{3}$/H$_{2}$O and H$_{2}$ gases. NH mode excitation in ND$_{3}$H$^{+}$ ion yielded a prominent \textit{Q} branch feature and parallel band rotational structure. Rotational transitions were confirmed unambiguously by four-line ground state combination differences within frequency measurement accuracy (10 MHz). The band origin was determined to be 3316.8413(9) cm$^{-1}$. Perturbation in the upper state was observed from analysis of residuals. In the case of ND$_{2}$H$_{2}$$^{+}$, both NH symmetric (\textit{b}-type) and anti-symmetric (\textit{c}-type) modes were observed and assigned for the first time, yielding band origins of 3297.5440(1) and 3337.9050(1) cm$^{-1}$, respectively. The intensity for the two fundamental bands was interpreted with simple context of a bond-dipole model. The present study provided high precision ground state rotational constants (\textit{A}$^{''}$=4.85675(4), \textit{B}$^{''}$=3.96829(4), \textit{C}$^{''}$=3.44667(6) cm$^{-1}$), which should facilitate microwave searches for isotope-substituted ammonium ions in the regions of interstellar medium, such as dense molecular clouds or younger stellar objects.
Issue Date:2014-06-16
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:Chang, C.; Nesbitt, D. SUB-DOPPLER JET-COOLED INFRARED SPECTROSCOPY OF ND2H2+ AND ND3H+ IN THE NH STRETCH FUNDAMENTAL MODES. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.WF04
Genre:Conference Paper / Presentation
Rights Information:Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License.
Date Available in IDEALS:2014-09-17

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