Disclosed herein is a linear, essentially non-crystalline copolyester composition comprising in polymerized form polymethylene glycol units of 2 to 6 carbon atoms, aliphatic dicarboxylic acid units of 5 to 10 carbon atoms, and isophthalic acid units, the isophthalic acid units comprising from about 10 to 50 mol percent of the total acid units, and the copolyester composition having an intrinsic viscosity in the range of about 0.3 to 0.8. The composition is useful in fabricating custom-molded earplugs by inserting into and sealing the auditory canal of the ear.
High-temperature photoelectron spectroscopy: a study of atomic and molecular antimony
作者:J.M. Dyke、A. Morris、J.C.H. Stevens
DOI:10.1016/0301-0104(86)85114-x
日期:1986.2
The gas-phase vacuum ultraviolet photoelectron spectra of Sb4, Sb2 and Sb have been recorded; the Sb2 and Sb being produced by superheating a flowing Sb4 beam. The molecular spectra are interpreted using Hartree—Fock—Slater calculations whereas the spectrum of atomic antimony is compared with that recorded previously for atomicarsenic and bismuth. In the Sb+2 (X2Πu) state, the spin-orbit splitting