Simple sample cell for examination of solids and liquids by photoacoustic spectroscopy

Abstract

sample and variation in scattering coefficients and molecular weights of the carotenoids. Larger errors might occur if the carotenoids have double-bond chains different from /3-carotene, but these effects would be apparent in the RR spectrum in the 1525 cm"1 region. No such effects were observed in the samples used in this work.

Digital simulation of temperature and pressure effects in photoacoustic spectroscopy

“…The basic PAS spectrometer operating in the single beam mode has been described elsewhere (8). The sample cell (Figure 1) was machined from aluminum and employed O-ring seals.…”

“…In 1973, experimental results were published (4,5) demonstrating the qualitative similarity between the usual optical absorption and photoacoustic spectra of certain solid samples. A number of papers concerning the application of photoacoustic spectroscopy (PAS) to solids and strongly absorbing solutions have since appeared (see, for example (6)(7)(8)(9)(10) and recent reviews (11)(12)(13)).…”

Direct comparison of the capabilities of photoacoustic and diffuse reflectance spectroscopies in the ultraviolet, visible, and near-infrared regions

“…The comparison of photoacoustic spectroscopy (PAS) (1) and diffuse reflectance spectroscopy (DRS) (2)(3)(4) has received considerable attention over the past few years. During the development of methods and instrumentation for PAS, diffuse reflectance spectra were often used in comparison to demonstrate the ability of PAS to obtain directly the undistorted absorption spectra of nontransparent solids (5)(6)(7). Since that time several more serious methodological comparisons have been carried out (8)(9)(10).…”

Photoacoustic cell for Fourier transform infrared spectrometry of surface species

“…Many different designs have been proposed in the literature for use as PA detection cells (2). These designs range from simple multipurpose cells (2,14,(26)(27)(28)(29) to elaborate special purpose designs (20,30,31). However, none of these designs in the literature are suitable for use in studies of reactive chemical systems.…”