Previously unobserved water lines detected in the post-impact spectrum of Comet Tempel 1

The recently puplished Barber-Tennyson (BT2) synthetic H$_2$O water line list is the most complete and accurate line list in existence. It is finding application in a wide range of astrophysical environments. UKIRT spectra of comet Tempel 1, obtained after the 'Deep Impact' event, revealed several known H$_2$O solar pumped fluorescent (SPF)lines in the 2.8945 to 2.8985 $\mu$m region. In addition, using synthetic spectra produced with BT2, several emission lines were identified that had not previously been recorded in cometary spectra. Unlike the SPF lines, which are transitions from doubly-excited stretch states, these transitions, that we label 'SH', are from states with three or four quanta of vibrational excitation. The SH features were particularly strong during the period 20-40 minutes after impact.