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Ultrafast Insights: A Fundamental Overview of Transient Absorption Spectroscopy

#spinelectronics #magnetic-materials #magnetization

Ultrafast Insights: A Fundamental Overview of Transient Absorption

Spectroscopy

Parvathy Nancy1 & Nandakumar Kalarikkal1,2,3

1 International Centre for Ultrafast Studies (ICUS), Mahatma Gandhi University, Kottayam-686560, Kerala,

India

2 International and Inter University Centre for Nanoscience and Nanotechnology (IIUCNN), Mahatma Gandhi

University, Kottayam-686560, Kerala, India

3 School of Nano Science and Nano Technology (SNSNT), Mahatma Gandhi University, Kottayam-686560,

Kerala, India

Abstract:

Transient Absorption Spectroscopy (TAS) offers a unique lens to observe the ultrafast processes that govern

the behaviour of matter immediately after excitation. TAS provides a direct visualization of excited-state

dynamics by using femtosecond pump-probe techniques, where carrier relaxation pathways, energy

redistribution and charge-transfer processes can be observed over timescales previously inaccessible by

standard spectroscopic techniques [1,2]. Besides, TAS allows to extract quantitative kinetic parameters, like

excited-state lifetimes, diffusion coefficients, and electron-phonon coupling strengths, and thus gain profound

understanding of the underlying processes that act to regulate light-matter interactions in complex materials.

This presentation will provide a brief, but thorough discussion of the key concepts of TAS, the experimental

configuration, issues of temporal and spectral resolution and how transient signals may be interpreted and how

TAS may transform our knowledge of ultrafast processes in chemistry, physics and materials science.

Reference

1. 6436.

2. Crane, Stuart W., et al. "The value of different experimental observables: a transient absorption study of the

ultraviolet excitation dynamics operating in nitrobenzene." The Journal of Physical Chemistry A 127.31 (2023): 6425-

Jia, Menghui, et al. "Transient Absorption Spectroscopy: Probing the Ultrafast Dynamics in Nanomaterial Complex

Systems." (2024).