Fourier Transform and Photoacoustic Absorption Spectra of Ethylene within 6035–6210 cm-1: Comparative Measurements

Recovery of absorption spectra from Fourier transform infrared (FT-IR) microspectroscopic measurements of intact spheres.

An infrared spectrum recorded from a microscopic sample depends on spectral properties of the constituent material as well as on morphology. Many samples or domains within heterogeneous materials can be idealized as spheres, in which both scattering and absorption from the three-dimensional shape affect the recorded spectrum. Spectra recorded from such objects may be altered to such an extent t...

Near Infrared Absorption of Ethylene between 8200 cm 1 and 9500 cm " 1 to High Pressures and Temperatures

The near infrared absorption of pure ethylene in the region of the second overtone of the C-H stretching fundamentals (8200 c m 1 to 9500 c m J ) was measured at supercritical temperatures {Tc = 9.5 °C) between 22 °C and 200 °C from 0.7 bar to 3000 bar. The density and temperature dependence of bandshape, maximum frequency and absorption intensity are reported and discussed. The bands observed ...

Line parameters of 15 N 216 O from Fourier transform measurements in the 5800 - 7600 cm - 1 region and

Using FT spectra (unapodized resolution ~ 0.0056 cm −1)) of nitrous oxide isotopologue 15 N 2 16 O, the line positions and intensities have been measured for 511 lines of 8 cold and one hot bands lying between 5800 and 7600 cm −1. A multispectrum fitting procedure has been used to retrieve line parameters from 5 experimental spectra recorded at different pressures. An absolute wavenumber calibr...

Fourier transform intracavity laser absorption spectra of the 6ν1 band of CHD3

Femtosecond laser Fourier transform absorption spectroscopy.

A femtosecond mode-locked laser is used for what is believed to be the first time as a broadband infrared source for high-resolution Fourier transform absorption spectroscopy. A demonstration is made with a Cr(4+):YAG laser. The entire nu(1)+nu(3) vibration-rotation band region of acetylene, observed after passing through a single-pass 80-cm-long cell, is simultaneously recorded between 1480 an...