Long Optical Paths of Large Aperture

Infrared multiple photon dissociation spectra of gaseous ions

“…For CF 3 , CF 3 , and C 2 F 6 the degenerate C-F stretching mode has a higher frequency than the nondegenerate C-F stretching mode. We assume a similar assignment for Ga(hfac) 31 with the degenerate C-F stretching mode assigned a higher frequency (ca. 1240 cm ) and the nondegenerate C-F stretching frequency assigned a lower frequency (,1 51 cm-1 ).…”

Laser-spectroscopic laboratory studies of atmospheric aqueous phase free radical chemistry

“…Sulfate radicals subsequently react with chloride anions added in excess to form chlorine atoms which in turn form Cl\ by adding chloride. Cl\ -concentration are monitored by the time-resolved detection of the 325 nm output of a HeCd laser the beam of which is folded through the reaction cell by means of a set of mirrors in White's configuration [6]. An optical pathlength of d"120 cm is obtained.…”

Near‐infrared absorption cross sections and integrated absorption intensities of molecular oxygen (O2, O2‐O2, and O2‐N2)

“…The FTS is interfaced to a coolable long-path absorption cell (LPAC) containing White's optics [White, 1942], which has been described in detail previously [Ballard et al, 1994;Strong, 1992], in the RAL Molecular Spectroscopy Facility. The LPAC was fitted with gold-coated mirrors and was otherwise configured as in previous oxygen measurements [Newnharn and Ballard, 1998].…”