Related Experiment Video
Updated: Aug 18, 2026

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
Published on: August 18, 2017
[The high resolution spectroscopy of CH35 Cl3 and CH35Cl2(37) V = 3 stretching overtone]
1Chemical Physics Department, University of Science and Technology of China, 230026 Hefei.
Abstract:
The Fourier transform spectrometer (FTS) is used to record the high resolution spectrum of V = 3 stretching overtone for two isotopic species: CH35Cl3 and CH35Cl2(37)Cl. The rotational constants of CH35Cl2(37) Cl are calculated approximately from its isotope, CH35Cl3. The ground states combination difference method is used to assign the observed transitions. Because of the relatively small rotational constant, the resolution of 0.02 cm(-1) is still not enough to resolve the rotational K structure of CHCl3. So, all the observed transitions are assigned as parallel band transitions arising from the k = 0 rotational states. A weighted non-linear least-square fitting program is developed to fit the assigned transitions and derive the rotational constants. The result of the fitting for the CH35Cl2(37)Cl spectrum indicates that it is reasonable and reliable to derive the spectroscopic parameters using the isotopic effect.
More Related Videos
Related Concept Videos
IR Frequency Region: X–H Stretching
IR Frequency Region: Alkyne and Nitrile Stretching
Comparing the stretching vibrational frequency of C≡C triple bonds with that of double and single bonds, it is evident that C≡C triple bonds exhibit a higher stretching frequency than C=C double and C–C single bonds. Similarly, the C≡N triple bond exhibits higher stretching absorption than the C=N...
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 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 stretch at a...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
IR and UV–Vis Spectroscopy of Aldehydes and Ketones

