Related Experiment Video
Updated: May 20, 2025

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
Rovibrational overtone and combination bands of the HCNH+ ion
Miroslava Kassayová1, Miguel Jiménez-Redondo2, János Sarka3
1Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague, 18000, Czech Republic.
Abstract:
Spectra of vibrational overtone and combination bands from vibrational ground state of were measured using an action spectroscopy technique with active background suppression in a cryogenic 22 pole radio frequency ion trap apparatus. Spectroscopic constants for the upper vibrational levels of the transitions were determined with vibrational band origins being 6846.77981(90) cm-1 (2ν1, NH stretch), 6640.47624(43) cm-1 (ν1+ν2), 6282.03578(63) cm-1 (2ν2, CH stretch), and 6588.4894(20) cm-1 (ν2+ν3+2ν50). State of the art ab initio VCI calculations up to 104cm-1 complement the experimental data.
More Related Videos
Related Concept Videos
IR Frequency Region: X–H Stretching
IR Spectroscopy: Molecular Vibration Overview
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
IR Spectrum Peak Broadening: Hydrogen Bonding
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular...
IR and UV–Vis Spectroscopy of Aldehydes and Ketones
IR Absorption Frequency: Hybridization
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...

