New p-Ge THz laser spectrometer for the study of solutions: THz absorption spectroscopy of water

2005 ◽  
Vol 76 (6) ◽  
pp. 063110 ◽  
Author(s):  
Andreas Bergner ◽  
Udo Heugen ◽  
Erik Bründermann ◽  
Gerhard Schwaab ◽  
Martina Havenith ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Laser Spectrometer ◽  
Thz Absorption

Exploring hydrophobicity by THz absorption spectroscopy of solvated amino acids

2011 ◽  
Vol 150 ◽  
pp. 193 ◽  
Author(s):  
Gudrun Niehues ◽  
Matthias Heyden ◽  
Diedrich A. Schmidt ◽  
Martina Havenith
Keyword(s):  
Amino Acids ◽  
Absorption Spectroscopy ◽  
Thz Absorption

Urea, a Structure Breaker? Answers from THz Absorption Spectroscopy

2012 ◽  
Vol 116 (45) ◽  
pp. 13374-13380 ◽  
Author(s):  
Stefan Funkner ◽  
Martina Havenith ◽  
Gerhard Schwaab
Keyword(s):  
Absorption Spectroscopy ◽  
Thz Absorption

scholarly journals Comparison of optical-feedback cavity-enhanced absorption spectroscopy and gas chromatography for ground-based and airborne measurements of atmospheric CO concentration

2017 ◽  
Vol 10 (5) ◽  
pp. 1803-1812 ◽  
Author(s):  
Irène Ventrillard ◽  
Irène Xueref-Remy ◽  
Martina Schmidt ◽  
Camille Yver Kwok ◽  
Xavier Faïn ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
High Performance ◽  
Optical Feedback ◽  
Mercuric Oxide ◽  
Gas Chromatograph ◽  
Laser Spectrometer ◽  
Airborne Measurements ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy ◽  
Compact Size

Abstract. We present the first comparison of carbon monoxide (CO) measurements performed with a portable laser spectrometer that exploits the optical-feedback cavity-enhanced absorption spectroscopy (OF-CEAS) technique, against a high-performance automated gas chromatograph (GC) with a mercuric oxide reduction gas detector (RGD). First, measurements of atmospheric CO mole fraction were continuously collected in a Paris (France) suburb over 1 week. Both instruments showed an excellent agreement within typically 2 ppb (part per billion in volume), fulfilling the World Meteorological Organization (WMO) recommendation for CO inter-laboratory comparison. The compact size and robustness of the OF-CEAS instrument allowed its operation aboard a small aircraft employed for routine tropospheric air analysis over the French Orléans forest area. Direct OF-CEAS real-time CO measurements in tropospheric air were then compared with later analysis of flask samples by the gas chromatograph. Again, a very good agreement was observed. This work establishes that the OF-CEAS laser spectrometer can run unattended at a very high level of sensitivity ( <  1 ppb) and stability without any periodic calibration.

scholarly journals Solvent dynamics play a decisive role in the complex formation of biologically relevant redox proteins

2020 ◽  
Vol 22 (14) ◽  
pp. 7451-7459 ◽  
Author(s):  
Ellen M. Adams ◽  
Oliver Lampret ◽  
Benedikt König ◽  
Thomas Happe ◽  
Martina Havenith
Keyword(s):  
Complex Formation ◽  
Absorption Spectroscopy ◽  
Critical Factor ◽  
Decisive Role ◽  
Redox Proteins ◽  
Biologically Relevant ◽  
Transient Complex ◽  
Solvent Dynamics ◽  
Thz Absorption

THz absorption spectroscopy reveals that water is a critical factor that governs the transient complex formation of redox proteins. Binding of the substrate creates an entropically favorable complex with bulk-like solvent dynamics.

THz absorption spectroscopy of solvated β-lactoglobulin

2014 ◽  
Vol 141 (22) ◽  
pp. 22D534 ◽  
Author(s):  
Hendrik Vondracek ◽  
Jessica Dielmann-Gessner ◽  
Wolfgang Lubitz ◽  
Markus Knipp ◽  
Martina Havenith
Keyword(s):  
Absorption Spectroscopy ◽  
Thz Absorption ◽  
Β Lactoglobulin
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