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0.153.72 THz absorption of aqueous salts and saline solutions Department of Physics, University of California, Santa Barbara, California 93106
 

Summary: 0.153.72 THz absorption of aqueous salts and saline solutions
Jing Xu
Department of Physics, University of California, Santa Barbara, California 93106
Kevin W. Plaxco
Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106
S. James Allena
Department of Physics, University of California, Santa Barbara, California 93106
Jon E. Bjarnasonb
Department of Electrical and Computer Engineering, University of California, Santa Barbara,
California 93106
Elliott R. Brownc
Department of Electrical and Computer Engineering, University of California, Santa Barbara,
California 93106
Received 26 October 2006; accepted 7 December 2006; published online 18 January 2007
It has recently been suggested that near-field terahertz ionic contrast microscopy can be employed
to image subtle changes in ionic concentrations arising from neuronal activity. To do so, however,
requires that solvated ions exhibit significant absorbance at terahertz frequencies. The authors have
investigated this issue and find that, at room temperature, the molar extinctions of both sodium
chloride and guanidine hydrochloride are approximately two orders of magnitude below some
previous measurements and are, therefore, too low to support the proposed imaging application.

  

Source: Allen, S. James - Department of Physics, University of California at Santa Barbara

 

Collections: Physics; Materials Science