Conference paper
Photothermal spectroscopy as a sensitive spectroscopic tool
A.C. Tam
SPIE Optics, Electro-Optics, and Laser Applications in Science and Engineering 1991
The phase angle of a gas-coupled photoacoustic (PA) signal has been measured as a function of coupling gas column thickness lg for a]] one-dimensional" PA cell. The PA signal is excited by a modulated continuous laser beam incident on an opaque solid surface of silicon. We show that the observed data can be explained in a PA model including the consideration of a residual volume in the PA cell, together with the consideration of viscous damping of the PA signal at small lg.
A.C. Tam
SPIE Optics, Electro-Optics, and Laser Applications in Science and Engineering 1991
A.C. Tam, W.P. Leung
Applied Physics Letters
A.C. Tam, W. Zapka, et al.
SPIE Microelectronic Processing Integration 1991
W. Zapka, M. Levenson, et al.
Optics Letters