Quantitative photoabsorption of methyl propyl ether in the UV, VUV and soft X-ray regions (5–200 eV)

Abstract

Absolute photoabsorption oscillator strengths (cross-sections) in the valence-shell discrete and continuum regions methyl propyl ether CH3OC3H7 have been measured from 5 to 32 eV using high-resolution (∼0.05 eV fwhm) dipole (e,e) spectroscopy. Wide-range spectra, spanning the UV, VUV and soft X-ray regions, have also been obtained at low-resolution (∼1 eV fwhm) from 5 to 200 eV for methyl propyl ether, and these wide-range spectra have been used to determine the absolute oscillator strength scales by employing valence-shell TRK (i.e., S(0)) sum-rule normalization. Evaluations of the S(−2) sum using the presently reported absolute differential photoabsorption oscillator strength data give a static dipole polarizability for methyl propyl ether in good agreement with previously reported polarizability values. Other dipole sums S(u), (u=−1,−3,−4,−5,−6,−8,−10), and logarithmic dipole sums L(u), (u=−1 to −6), are also determined from the presently reported absolute differential photoabsorption oscillator strength data using dipole sum-rules. The presently reported absolute photoabsorption oscillator strength data for methyl propyl ether (and all other atoms and molecules we have studied) are web-accessible at ftp.chem.ubc.ca/pub/cooper.