Fully automated dual-frequency three-pulse-echo 2DIR spectrometer accessing spectral range from 800 to 4000 wavenumbers.

Autor:	Leger JD; Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA., Nyby CM; Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA., Varner C; Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA., Tang J; Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA., Rubtsova NI; Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA., Yue Y; Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA., Kireev VV; Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA., Burtsev VD; Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA., Qasim LN; Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA., Rubtsov GI; Institute for Nuclear Research of the Russian Academy of Sciences, Moscow 117312, Russian Federation., Rubtsov IV; Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA.
Jazyk:	angličtina
Zdroj:	The Review of scientific instruments [Rev Sci Instrum] 2014 Aug; Vol. 85 (8), pp. 083109.
DOI:	10.1063/1.4892480
Abstrakt:	A novel dual-frequency two-dimensional infrared instrument is designed and built that permits three-pulse heterodyned echo measurements of any cross-peak within a spectral range from 800 to 4000 cm(-1) to be performed in a fully automated fashion. The superior sensitivity of the instrument is achieved by a combination of spectral interferometry, phase cycling, and closed-loop phase stabilization accurate to ~70 as. The anharmonicity of smaller than 10(-4) cm(-1) was recorded for strong carbonyl stretching modes using 800 laser shot accumulations. The novel design of the phase stabilization scheme permits tuning polarizations of the mid-infrared (m-IR) pulses, thus supporting measurements of the angles between vibrational transition dipoles. The automatic frequency tuning is achieved by implementing beam direction stabilization schemes for each m-IR beam, providing better than 50 μrad beam stability, and novel scheme for setting the phase-matching geometry for the m-IR beams at the sample. The errors in the cross-peak amplitudes associated with imperfect phase matching conditions and alignment are found to be at the level of 20%. The instrument can be used by non-specialists in ultrafast spectroscopy.
Databáze:	MEDLINE
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