scholarly journals Sensitivity of 2D IR Spectra to Peptide Helicity: A Concerted Experimental and Simulation Study of an Octapeptide

2009 ◽  
Vol 113 (35) ◽  
pp. 12037-12049 ◽  
Author(s):  
Neelanjana Sengupta ◽  
Hiroaki Maekawa ◽  
Wei Zhuang ◽  
Claudio Toniolo ◽  
Shaul Mukamel ◽  
...  
Keyword(s):  
Ir Spectra ◽  
Simulation Study ◽  
2D Ir ◽  
Peptide Helicity

Instrumental Aspects of Dynamic Two-Dimensional Infrared Spectroscopy

1993 ◽  
Vol 47 (9) ◽  
pp. 1324-1328 ◽  
Author(s):  
Curtis Marcott ◽  
A. E. Dowrey ◽  
Isao Noda
Keyword(s):  
Ir Spectra ◽  
Two Dimensional ◽  
Time Resolved ◽  
Ir Spectrometry ◽  
2D Ir ◽  
Scanning Interferometer ◽  
Atactic Polystyrene ◽  
Ft Ir ◽  
The Time Domain ◽  
Two Dimensional Infrared Spectroscopy

Dynamic two-dimensional infrared (2D IR) correlation maps are a convenient means of examining the information contained in time-resolved IR spectra. Dynamic 2D IR spectra can be collected with the use of either dispersive or Fourier transform (FT) IR spectrometers. Use of a step-scanning FT-IR spectrometer has advantages over conventional rapid-scan FT-IR spectrometry when one is acquiring time-resolved IR data on time scales faster than about 0.1 s, because the spectral multiplexing is removed from the time domain. Dynamic IR spectra of atactic polystyrene (undergoing a small-amplitude oscillatory strain) collected on both dispersive and FT instrumentation are compared. Although the dispersive approach produces higher signal-to-noise ratios over small spectral regions, the multiplex advantage makes the FT approach attractive when broader spectral coverages are required. The first vibrational circular dichroism (VCD) spectrum [of (–)- α;-pinene] collected on a step-scanning interferometer is also presented.

scholarly journals Comparison of Linear and 2D IR Spectra in the Presence of Fast Exchange

2006 ◽  
Vol 110 (17) ◽  
pp. 8531-8534 ◽  
Author(s):  
Yung Sam Kim ◽  
Robin M. Hochstrasser
Keyword(s):  
Ir Spectra ◽  
2D Ir ◽  
Fast Exchange

scholarly journals 2D IR spectra of cyanide in water investigated by molecular dynamics simulations

2013 ◽  
Vol 139 (5) ◽  
pp. 054506 ◽  
Author(s):  
Myung Won Lee ◽  
Joshua K. Carr ◽  
Michael Göllner ◽  
Peter Hamm ◽  
Markus Meuwly
Keyword(s):  
Molecular Dynamics ◽  
Ir Spectra ◽  
Molecular Dynamics Simulations ◽  
2D Ir ◽  
Dynamics Simulations

Recent Developments in Two-Dimensional Infrared (2D IR) Correlation Spectroscopy

1993 ◽  
Vol 47 (9) ◽  
pp. 1317-1323 ◽  
Author(s):  
I. Noda ◽  
A. E. Dowrey ◽  
C. Marcott
Keyword(s):  
Ir Spectroscopy ◽  
Ir Spectra ◽  
Correlation Method ◽  
External Perturbation ◽  
Correlation Spectroscopy ◽  
Two Dimensional ◽  
2D Ir ◽  
Different Types ◽  
Recent Developments ◽  
Arbitrary Time Dependence

Recent developments in two-dimensional infrared (2D IR) correlation spectroscopy are reviewed. Since the initial introduction of the basic concept seven years ago, the field of 2D IR spectroscopy has evolved considerably. The method for generating 2D IR spectra from perturbation-induced time-dependent fluctuations of IR intensities and the properties of such 2D spectra are summarized first. Applications of 2D IR spectroscopy are then surveyed, and improvements in the instrumentation are reviewed. Different types of external perturbation schemes capable of inducing dynamic fluctuations of IR spectra are listed. Finally, a new 2D correlation method for dynamic spectral data with arbitrary time-dependence is discussed.

scholarly journals Two-dimensional infrared spectroscopy of vibrational polaritons

2018 ◽  
Vol 115 (19) ◽  
pp. 4845-4850 ◽  
Author(s):  
Bo Xiang ◽  
Raphael F. Ribeiro ◽  
Adam D. Dunkelberger ◽  
Jiaxi Wang ◽  
Yingmin Li ◽  
...  
Keyword(s):  
Ir Spectra ◽  
Mechanical Model ◽  
Quantum Mechanical ◽  
Two Dimensional ◽  
Coherent Light ◽  
Molecular Systems ◽  
2D Ir ◽  
New Interpretation ◽  
The Impact ◽  
Two Dimensional Infrared Spectroscopy

We report experimental 2D infrared (2D IR) spectra of coherent light–matter excitations––molecular vibrational polaritons. The application of advanced 2D IR spectroscopy to vibrational polaritons challenges and advances our understanding in both fields. First, the 2D IR spectra of polaritons differ drastically from free uncoupled excitations and a new interpretation is needed. Second, 2D IR uniquely resolves excitation of hybrid light–matter polaritons and unexpected dark states in a state-selective manner, revealing otherwise hidden interactions between them. Moreover, 2D IR signals highlight the impact of molecular anharmonicities which are applicable to virtually all molecular systems. A quantum-mechanical model is developed which incorporates both nuclear and electrical anharmonicities and provides the basis for interpreting this class of 2D IR spectra. This work lays the foundation for investigating phenomena of nonlinear photonics and chemistry of molecular vibrational polaritons which cannot be probed with traditional linear spectroscopy.

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