Photoacoustic rotational raman spectroscopy

Details Photoacoustic rotational raman spectroscopy Photoacoustic rotational raman spectroscopy

G - Physics

01

N

73/55

G01N 21/00 (2006.01) G01J 3/44 (2006.01)

Patent

CA 1143587

ABSTRACT "PHOTOACOUSTIC ROTATIONAL RAMAN SPECTROSCOPY" A method and apparatus for spectroscopic material analysis are provided. Two coherent beams of monochromatic radiation are directed through a sample of material. A tuning mechanism adjusts the frequency difference between the radiation beams to equal substan- tially the rotational frequency of a preselected con- stituent of the material. Molecular energy of a preselected constituent of the material is increased, thereby producing a detectable signal in the form of a pressure wave. The signal is received by a detecting mechanism which indicates the magnitude thereof.

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