Raman spectral studies of .alpha.- and .beta.-trifluoroxenon hexafluoroantimonates, trifluoroxenon(1+) undecafluorodiantimonate(1-), trifluoroxenon(1+) hexafluoroarsenate(1-), trifluorooxoxenon(1+) hexafluoroantimonate(1-) and undecafluorodiantimonate(1-), and fluorodioxoxenon(1+) undecafluorodiantimonate(1-) Journal Articles