Knowledge Bank

Recently $Watson1$ Identified the $2v2(\ell =2)\to 0$ overtone emission-band of $H3+$ in a Fourier transform infrared spectrum discovered by astronomers in $Jupiter.2$ In order to better understand the spectrum we are extending our earlier studies to more observation of hot bands and overtone bands. A difference frequency spectrometer using a $LiI03$ crystal as the non-linear optical element is used to cover the wide wavelength region of $2\sim 5.5\mu m$. A liquid-nitrogen cooled $H2$-He plasma is used to produce vibrationally hot $H3+$. The observatian and analysis of the spectrum based on the first principle calculation of Miller and Tennyson will be reported.