Related Experiment Video
Updated: Aug 9, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
Published on: December 18, 2015
C-13 Methanol Far-Infrared Laser: Newly Discovered Lines, Predictions, and Assignments
1Departamento de Eletronica Quantica, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, 13083-970, Brazil
Abstract:
We report 25 new laser lines from 13CH3OH methanol when pumped by a cw CO2 laser. The majority of the lines are pumped by the 10R (regular) and 10SR (sequence) bands of the CO2 laser. Two are pumped by the 9HP(20) hot-band CO2 line. We measured 22 laser frequencies in this molecule, 19 from new lines and three from previously reported lines. We also remeasured and corrected the frequency of the 9P(44) pumped line as 3 378 404.87 MHz (88.738 μm). We assigned two lines-10SR(17), 77.5758 cm-1 and 10R(50), 119.3020 cm-1-and predicted other potential far-infrared laser lines with these two pumps. Copyright 1998 Academic Press.
Related Concept Videos
Carbon-13 (¹³C) NMR: Overview
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
UV–Vis Spectroscopy: Molecular Electronic Transitions
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 Frequency Region: Fingerprint Region
The...

