Weak line water vapor spectrum in the 11,787–13,554 cm−1 region

Long-pathlength Fourier transform spectra of water vapor recorded previously by Schermaul et al. (J. Mole. Spectrosc. 211, 169 (2002)) are analyzed in the range 11 787–13 554 cm−1. Wavenumbers, absolute intensities, and self-broadening coefficients, with associated uncertainties, are presented for 2137 lines. Analysis of these lines using variational linelists has been conducted leading to the assignment of 1906 of the new lines to 23 different upper vibrational states in the 3ν+δ, 4ν, and 4ν+δ polyads, a further 19 lines are ascribed to H218O. Comparisons are made with the HITRAN database

Weak line water vapor spectrum in the 13 200–15 000 cm−1 region

New Fourier transform spectra of water vapor are presented in the range 6500–16 400 cm−1 obtained using pathlengths of up to 800 m and long integration times. These spectra have a significantly higher signal-to-noise than previous measurements in this wavenumber range. Wavenumbers, absolute intensities and self-broadening coefficients, all with associated uncertainties, are presented for 3604 lines in the region 13 200–15 000 cm−1. Analysis of these lines using variational linelists, along with other unassigned lines from previous studies, has been conducted. This leads to 952 new line assignments to transitions involving 35 different vibrational states of H216O. A smaller number of lines are assigned to H218O and H217O

Observation of the enhancement of coherence by backscattering through turbulence

We present results of an experiment in which a plane mirror is coherently illuminated and viewed through a turbulent cell. Using a two-pinhole aperture in the pupil plane for both illumination and viewing, we have obtained time-averaged images containing fringes. This gives qualitative confirmation of theoretical predictions claiming that the enhanced back-scattering effect may be used to image deterministic objects. © 1992