| The water cation(H2O+)and hydronium(H3O+)and its partially and fully dcuterated species are of great interest to molecular spectroscopists,because of their presence in the upper atmosphere,interstellar space,and oxygen-rich circumstellar envelopes.The measurement and analysis of the high resolution spectra of these water-relevant molecular ions are crucial to the other related research in astrophysics,atmospheric chemistry,and biophysics.In this dissertation,the absorption spectrum ofν2(1-â†0+)band of H3O+ was measured using mid-infrared velocity modulation laser spectroscopy.The H3O+ ions were produced in a high-voltage audio glow discharge of the mixtures of He/H2O. Twenty-five new lines were observed between 1070 and 1230 cm-1.The measured transitions together with the data published previously were analyzed by a least-squares fitting procedure.A set of improved constants for the 0+ and 1- states of theν2 bending mode,especially including all the sextic centrifugal distortion rotational constants,has been determined.Theν2(1â†0)band of D2O+ was observed by mid-infrared velocity modulation laser spectroscopy for the first time.The D2O+ ions were generated in the discharge of the mixtures of He/D2O.We identified 64 transitions in the spectral range 1000～1150 cm-1.Precise molecular constants for the ground andν2 = 1 vibrational-excited state of D2O+ have been derived by a least-squares fitting.Theν2(1â†0)band origin was determinated to be 1044.28594(39)cm-1.
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