Vibrationally hot bands of the SiCN Ã 2Δ - X̃ 2Π system
Masaru Fukushima1, Takashi Ishiwata
1Faculty of Information Sciences, Hiroshima City University , Hiroshima 731-3194, Japan.
Abstract:
We have generated SiCN in supersonic free jet expansions and observed the laser induced fluorescence (LIF) spectrum. In addition to the vibronic bands from the vibrationless level of the X̃ (2)Π state, the hot bands from the bending vibrational level, à (01(1)0) (2)Φ - X̃ (01(1)0) (2)Δ and à (01(1)0) (2)Π - X̃ (01(1)0) (2)Σ((-)), have been measured. The rotational energy levels were reasonably analyzed as those of the (2)K' - (2)K″ transitions, but their line intensities calculated from the Hönl-London factors derived in the intermediate case between Hund's case (a) and (b) could not reproduce the observed spectra. The Hönl-London factors derived in the (2)Λ' - (2)Λ″ ((2)Δ - (2)Π) transition reasonably reproduced the spectra. It indicates that coupling between the electronic orbital and vibrational angular momenta is weak in the SiCN (2)Δ - (2)Π system, and a basis set of |Λ v2 l Σ;J P MJ>, the so-called "l-basis", better describes the system than that of |Λ v2 K Σ;J P MJ>.
More Related Videos
13:56Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
Published on: October 12, 2019
10:32Sample Preparation and Transfer Protocol for In-Vacuum Long-Wavelength Crystallography on Beamline I23 at Diamond Light Source
Published on: April 23, 2021
Related Concept Videos
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...
¹H NMR: Interpreting Distorted and Overlapping Signals
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
Energy Bands in Solids
Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states that no two...
Molecular Orbital Theory II
IR Frequency Region: X–H Stretching
