000			02847nam a22002657a 4500
005			20231106100325.0
008			231030b ||||| |||| 00| 0 eng d
022			_a0021-9584
037			_bRIEBPL Library
082			_a540.7
100			_aIlana J. Porter et al ...
245			_a Coherent Phonons in Antimony: An Undergraduate Physical Chemistry Solid-State Ultrafast Laser Spectroscopy Experiment _b(Journal Article) _c
260			_aWashington, United States _b:American Chemical Society _c,January 10, 2023
300			_a 342-349p.
490			_aAmerican Chemical Society, Volume 100, Issue 1
505			_a***______{For Hard Copy, Please visit Library.}________***
520			_aAbstract:- Ultrafast laser pump–probe spectroscopy is an important and growing field of physical chemistry that allows the measurement of chemical dynamics on their natural time scales, but undergraduate laboratory courses lack examples of such spectroscopy and the interpretation of the dynamics that occur. Here we develop and implement an ultrafast pump–probe spectroscopy experiment for the undergraduate physical chemistry laboratory course at the University of California Berkeley. The goal of the experiment is to expose students to concepts in solid-state chemistry and ultrafast spectroscopy via classic coherent phonon dynamics principles developed by researchers over multiple decades. The experiment utilizes a modern high-repetition-rate 800 nm femtosecond Ti:sapphire laser, split pulses with a variable time delay, and sensitive detection of transient reflectivity signals using the lock-in technique. The experiment involves minimal intervention from students and is therefore easy and safe to implement in the laboratory. Students first perform an intensity autocorrelation measurement on the femtosecond laser pulses to obtain their temporal duration. Then, students measure the pump–probe reflectivity of a single-crystal antimony sample to determine the period of coherent phonon oscillations initiated by an ultrafast pulse excitation, which is analyzed by fitting to a sine wave. Students who completed the experiment in-person obtained good experimental results, and students who took the course remotely due to the COVID-19 pandemic were provided with the data they would have obtained during the experiment to analyze. Evaluation of student written and oral reports reveals that the learning goals were met, and that students gained an appreciation for the field of ultrafast laser-induced chemistry.
650			_aUpper-Division Undergraduate
650			_a Physical Chemistry
650			_aLaboratory Instruction Hands-On Learning
650			_aChemistry Spectroscopy Lasers
650			_aMetalloids/Semimetals Quantum Chemistry
856			_uhttps://doi.org/10.1021/acs.jchemed.2c00816
942			_cPER
999			_c44691 _d44690