Vibrational correlations via coherent multi-resonant four-wave mixing

Wright, John

doi:10.1016/j.vibspec.2004.02.009

Cited by 3 publications

(1 citation statement)

References 72 publications

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“…Two-dimensional infrared methods address the spectral complexity accompanying the study of conformationally flexible molecules in room-temperature solution by subjecting the sample to sequences of IR pulses that produce signals arising from anharmonic coupling between the infrared chromophores (e.g., the CO groups). ,− These off-diagonal features in the two-dimensional spectrum reflect the spatial proximity and relative orientation of the anharmonically coupled groups and can thereby be used as a diagnostic of conformation and as a means to uncover the presence of multiple conformations even when they overlap in the linear absorption spectrum.…”

Section: Introductionmentioning

confidence: 99%

Laser Probes of Conformational Isomerization in Flexible Molecules and Complexes

2006

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Molecules with several flexible coordinates have potential energy surfaces with a large number of minima and many transition states separating them. A general experimental protocol is described that is capable of studying conformational isomerization in such circumstances, measuring the product quantum yields following conformation-specific infrared excitation, and measuring energy thresholds for isomerization of specific X --> Y reactant-product isomer pairs following excitation via stimulated emission pumping (SEP). These methods have been applied to a series of molecules of varying size and conformational complexity, including 3-indolepropionic acid (IPA), meta-ethynylstyrene, N-acetyltryptophan methyl amide (NATMA), N-acetyltryptophan amide (NATA), and melatonin. Studies of isomerization in solute-solvent complexes are also described, including a measurement of the barrier to isomerization in the IPA-H2O complex, and a unique isomerization reaction in which a single water molecule is shuttled between H-bonding sites on the trans-formanilide (TFA) molecule.

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Section: Introductionmentioning

confidence: 99%

Laser Probes of Conformational Isomerization in Flexible Molecules and Complexes

2006

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Progress in two-dimensional (2D) correlation spectroscopy

Noda¹

2006

Journal of Molecular Structure

141

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Si-H bond dynamics in hydrogenated amorphous silicon

Scharff

McGrane

2007

Phys. Rev. B

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The ultrafast structural dynamics of the Si-H bond in the rigid solvent environment of an amorphous silicon thin film is investigated using two-dimensional infrared four-wave mixing techniques. The two-dimensional infrared ͑2DIR͒ vibrational correlation spectrum resolves the homogeneous line shapes ͑Ͻ2.5 cm −1 linewidth͒ of the 0 → 1 and 1 → 2 vibrational transitions within the extensively inhomogeneously broadened ͑78 cm −1 linewidth͒ Si-H vibrational band. There is no spectral diffusion evident in correlation spectra obtained at 0.2, 1, and 4 ps waiting times. The Si-H stretching mode anharmonic shift is determined to be 84 cm −1 and decreases slightly with vibrational frequency. The 1 → 2 linewidth increases with vibrational frequency. Frequency dependent vibrational population times measured by transient grating spectroscopy are also reported. The narrow homogeneous line shape, large inhomogeneous broadening, and lack of spectral diffusion reported here present the ideal backdrop for using a 2DIR probe following electronic pumping to measure the transient structural dynamics implicated in the Staebler-Wronski degradation ͓Appl. Phys. Lett. 31, 292 ͑1977͔͒ in a-Si: H based solar cells.

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Vibrational correlations via coherent multi-resonant four-wave mixing

Cited by 3 publications

References 72 publications

Laser Probes of Conformational Isomerization in Flexible Molecules and Complexes

Laser Probes of Conformational Isomerization in Flexible Molecules and Complexes

Progress in two-dimensional (2D) correlation spectroscopy

Si-H bond dynamics in hydrogenated amorphous silicon

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