Quantitative photoabsorption of diethyl ether in the valence and carbon 1s inner shell regions (5–360 eV)

Absolute photoabsorption oscillator strengths (cross-sections) in the valence-shell discrete and continuum regions of diethyl ether C2H5OC2H5 have been measured from 5 to 32 eV using high-resolution (HR) (∼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 (LR) (∼1 eV fwhm) from 5 to 360 eV which covers the valence-shell and C 1s inner-shell regions. The LR spectrum has been used to determine the absolute oscillator strength scale by employing valence-shell TRK (i.e., S(0)) sum-rule normalization. Evaluation of the S(−2) sum using the presently reported absolute differential photoabsorption oscillator strength data gives a static dipole polarizability for diethyl ether in good agreement with previously reported polarizability values obtained by other methods. 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 are web-accessible at ftp.chem.ubc.ca/pub/cooper.