Terahertz time-domain spectroscopy of torsional vibrational modes of tryptophan

2004 ◽  
Author(s):  
B. L. Yu ◽  
Q. Xing ◽  
Robert R. Alfano
Keyword(s):  
Time Domain ◽  
Vibrational Modes ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy

Characteristic fingerprint spectrum of neurotransmitter norepinephrine with broadband terahertz time-domain spectroscopy

The Analyst ◽  
2019 ◽  
Vol 144 (8) ◽  
pp. 2504-2510 ◽  
Author(s):  
Zhongjie Zhu ◽  
Chao Cheng ◽  
Chao Chang ◽  
Guanhua Ren ◽  
Jianbing Zhang ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Time Domain ◽  
Vibrational Modes ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Thz Absorption ◽  
Broadband Terahertz

A broadband THz absorption spectrum of NE corresponds to specific vibrational modes.

scholarly journals Investigation of the terahertz vibrational modes of ZIF-8 and ZIF-90 with terahertz time-domain spectroscopy

2015 ◽  
Vol 51 (89) ◽  
pp. 16037-16040 ◽  
Author(s):  
Nicholas Y. Tan ◽  
Michael T. Ruggiero ◽  
Claudia Orellana-Tavra ◽  
Tian Tian ◽  
Andrew D. Bond ◽  
...  
Keyword(s):  
Time Domain ◽  
Vibrational Modes ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Gate Opening ◽  
Terahertz Frequencies ◽  
Zeolitic Imidazole Frameworks

We present experimental and computational evidence that gate-opening modes for zeolitic imidazole frameworks can be observed at terahertz frequencies.

scholarly journals Torsional Vibrational Modes of Tryptophan Studied by Terahertz Time-Domain Spectroscopy

2004 ◽  
Vol 86 (3) ◽  
pp. 1649-1654 ◽  
Author(s):  
B. Yu ◽  
F. Zeng ◽  
Y. Yang ◽  
Q. Xing ◽  
A. Chechin ◽  
...  
Keyword(s):  
Time Domain ◽  
Vibrational Modes ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy

scholarly journals Low-frequency collective vibrational modes of asparagine by terahertz time-domain spectroscopy

2006 ◽  
Vol 55 (8) ◽  
pp. 4091
Author(s):  
Ma Shi-Hua ◽  
Shi Yu-Lei ◽  
Xu Xin-Long ◽  
Yan Wei ◽  
Yang Yu-Ping ◽  
...  
Keyword(s):  
Time Domain ◽  
Low Frequency ◽  
Vibrational Modes ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Collective Vibrational Modes

Narrow-Line Waveguide Terahertz Time-Domain Spectroscopy of Aspirin and Aspirin Precursors

2008 ◽  
Vol 62 (3) ◽  
pp. 319-326 ◽  
Author(s):  
N. Laman ◽  
S. Sree Harsha ◽  
D. Grischkowsky
Keyword(s):  
Salicylic Acid ◽  
Time Domain ◽  
Low Frequency ◽  
Far Infrared ◽  
Metal Plate ◽  
Thz Radiation ◽  
Vibrational Modes ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Parallel Plate Waveguide

Low frequency vibrational modes of pharmaceutical molecules are dependent on the molecule as a whole and can be used for identification purposes. However, conventional Fourier transform far-infrared spectroscopy (FT-IR) and terahertz time-domain spectroscopy (THz-TDS) often result in broad, overlapping features that are difficult to distinguish. The technique of waveguide THz-TDS has been recently developed, resulting in sharper spectral features. Waveguide THz-TDS consists of forming an ordered polycrystalline film on a metal plate and incorporating that plate in a parallel-plate waveguide, where the film is probed by THz radiation. The planar order of the film on the metal surface strongly reduces the inhomogeneous broadening, while cooling the waveguide to 77 K reduces the homogeneous broadening. This combination results in sharper absorption lines associated with the vibrational modes of the molecule. Here, this technique has been demonstrated with aspirin and its precursors, benzoic acid and salicylic acid, as well as the salicylic acid isomers 3- and 4-hydroxybenzoic acid. Linewidths as narrow as 20 GHz have been observed, rivaling single crystal measurements.

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