Related Experiment Video
Updated: Apr 17, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
Published on: February 10, 2020
Investigating Effect of Decoherence on Fano Interference through Raman Spectroscopy
Payal Ratnawat1, Omkar V Rambadey1, Nikita Jain1
1Materials Research Laboratory, Department of Physics, Indian Institute of Technology Indore, Khandwa Road, Indore 453552, Madhya Pradesh, India.
None:
In this paper, we report on the influence of structural and thermal decoherence on the Raman line shape undergoing Fano interference. Using BaTiO3 as a model sample, we examine its well-known ∼180 cm-1 Raman mode that originates due to the Fano interference between a discrete phonon (A1(TO1)) at 172 cm-1, and the continuum formed by the 250 cm-1 (A1(TO2)) phonons. Additionally, the asymmetric ∼521 cm-1 mode in p-type doped silicon is examined. The decoherence is demonstrated by introducing random phase fluctuation to the energy-dependent scattering phase Δ(ε) appearing in the typical Fano treatment with the help of a stochastic Monte Carlo approach, and a complete methodology is presented to explain the changes in the Raman line shape. Our approach successfully explains observed changes in the intensity and line shape of mode, suggesting that decoherence is a crucial factor controlling the Raman profiles.
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...
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...
¹³C NMR: ¹H–¹³C Decoupling
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Atomic Absorption Spectroscopy: Interference
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Atomic Emission Spectroscopy: Interference
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...

