Related Experiment Video
Updated: Jun 17, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
Published on: February 10, 2020
Stimulated Raman effect in some tetrahedral molecules
D H Rank1, R V Wick, T A Wiggins
1Physics Department, The Pennsylvania State University, University Park, Pennsylvania, USA.
Abstract:
Stimulated Raman spectra have been excited in liquid SnCl(4) and in methane gas making use of a medium high-power ruby laser. The spectra have been photographed by means of a high-resolution grating spectrograph. The Deltagamma value approximately nu(1) for methane was found to be 2916.605 cm(-1) +/- 0.012 cm(-1). No detectable pressure shift was observed over a range of gas densities from 3 amagat to 12 amagat. The stimulated Raman lines in methane are very sharp and only slightly broader than the laser line. In SnCl4 the first Stokes line consists of only a single component instead of the expected isotopic triplet. The half-intensity width of this line was found to be 0.5 cm(-1). At least 0.15 cm(-1) of this line-width must be due to the stimulated Brillouin doublet since the threshold is lower for the stimulated Brillouin effect than for the stimulated Raman effect. The stimulated Brillouin effect was observed with a Fabry-Perot etalon. Measurements of the Fabry-Perot patterns gave a value of 840 m per see for the velocity of sound in SnCl(4) at 27 degrees C.
More Related Videos
Related Concept Videos
Raman Spectroscopy: Overview
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...
Raman Spectroscopy Instrumentation: Overview
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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...
Molecular Spectroscopy: Absorption and Emission
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
UV–Vis Spectroscopy: Molecular Electronic Transitions

