The infra-red spectrum of water

Robertson, Charles W.; Curnutte, B.; Williams, Dudley

doi:10.1080/00268977300101501

Cited by 43 publications

(7 citation statements)

References 10 publications

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“…Below ϳ1.5 THz our absorption data are in excellent agreement with previously published values. [1][2][3][4][5][6][7][8] Above this frequency, however, we observe statistically significant discrepancies between our observations and those previously reported using optically pumped FIR laser transmission spectroscopy, [5][6][7] and FIR grating measurements 8 ͑Fig. 2͒.…”

Section: Resultscontrasting

confidence: 99%

Absorption spectra of liquid water and aqueous buffers between 0.3 and 3.72THz

Xu¹,

Plaxco²,

Allen³

2006

The Journal of Chemical Physics

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We have developed a terahertz absorption spectrometer suitable for strongly absorbing liquids such as water, and have precisely measured the absorption spectrum of water between 0.3 and 3.72 THz (10-124 cm(-1)). We have also examined the absorption spectra of aqueous 50 mM potassium phosphate buffers at pH 3 and 8, and find that they do not differ significantly from pure distilled de-ionized water.

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Section: Resultscontrasting

confidence: 99%

Absorption spectra of liquid water and aqueous buffers between 0.3 and 3.72THz

Xu¹,

Plaxco²,

Allen³

2006

The Journal of Chemical Physics

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“…Below ~ 1.5 THz our absorption data is in excellent agreement with the published data [1][2][3][4][5][6][7][8] . Above this frequency, however, we observe statistically significant discrepancies between our observations and those previously reported using optically pumped FIR laser transmission spectroscopy [5][6][7] , and FIR grating measurements 8 (Fig.…”

Section: Resultssupporting

confidence: 82%

Biological Sensing with Terahertz Circular Dichroism Spectroscopy

Allen¹

2005

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Public Reporting Burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. ABSTRACTWe have developed a circular dichroism spectrometer working in the terahertz (THz) frequency regime. As THz spectroscopy is specific to collective vibrational modes in macromolecules (and collective modes in condensed, polar media such as water), the spectrometer should provide spectral fingerprints of biological materials. Moreover, by focusing on circular dichroism the spectrometer should provide fingerprints of these materials uncontaminated by the strong background absorbance of water and other polar materials. We have built this spectrometer and have pushed its signal to noise down to 1 part in 10^4. While this is more than sufficient to detect the strong circular dichroism of macroscopic, chiral objects, it is apparently insufficient to observe circular dichroism arising from common biological materials. Current efforts are aimed at 1-2 orders of magnitude improvements on this detection limit.(a) Papers published in peer-reviewed journals (N/A for none)Xu, J., Ramian, G.J., Galan, J.F., Savvidis, P.G., Scopatz, A.M., Birge, R.R. Allen, S.J. and Plaxco, K.W. (2003) "Terahertz circular dichroism spectroscopy: a potential approach to unbiased, in situ life detection." Astrobiology, 3, 489-504

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“…A simulation of the FIR absorption spectra of water with instantaneous normal mode theory 25 and twofraction model for low-frequency Debye relaxation 26 predicted similar absorbance spectra. Experimental data using transmission spectroscopy 27 in this frequency range also showed the same behavior.…”

Section: Resultssupporting

confidence: 66%

Pore size dependent dynamics of confined water probed by FIR spectroscopy

Pérez-Hernández

Luong

Pérez

et al. 2010

Phys. Chem. Chem. Phys.

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We measured the FIR (Far Infrared) absorbance of a series of organic hydrated sub-nanopores (i.e. pores of the size of several A) containing confined water. Our results show that the FIR frequency region between 400 and 570 cm(-1) is sensitive to the differences in water mobility. The absorbance of these compounds was significantly higher than that of chemically similar anhydrous or non-porous hydrated compounds in the same region. Moreover, changes in the water dynamics inside the hydrated pores were found and characterized by their temperature dependent studies in the range from -5 to 20 degrees C. Upon increasing the temperature, water confined in narrow pores shows a small increase in FIR absorbance, while less confined water molecules inside larger pores exhibit a higher increase in absorbance, resembling more what has been observed for bulk water.

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The infra-red spectrum of water

Cited by 43 publications

References 10 publications

Absorption spectra of liquid water and aqueous buffers between 0.3 and 3.72THz

Absorption spectra of liquid water and aqueous buffers between 0.3 and 3.72THz

Biological Sensing with Terahertz Circular Dichroism Spectroscopy

Pore size dependent dynamics of confined water probed by FIR spectroscopy

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