| The spectra of the molecular ions are of considerable importance in physical and chemical fields. They are not only the key subject in the molecular spectroscopy, but also the important foundation of the relative studies. The comet-tail system of CO* has been applied in the study of radiative heating of hypersonic spacecraft at escape velocity and inthe atmospheric fringe of the planet Venus.Optical heterodyne magnetic rotation enhanced velocity modulation spectroscopy(OH-MR-VMS) was employed in this paper. We obtained the absorption spectra of comet-tail system of CO+ with high resolution in the near infrared spectral region 12100cm-1-14030cm-1, including three bands(0,3), (1,4)and(3,6). Most of the previous studies have employed the techniques of emission spectroscopy, which is sometimes limited by overlaps and perturbations of the spectra of ions and neutral species. Thus the sensitivity and resolution are relatively low. OH-MR-VMS used here improved the sensitivity and the signal-to-noise ratio, Meanwhile it can greatly suppress the perturbation from the strong spectral lines of neutrals, the resolution has been highlyimproved and a set of precise molecular constants for the A2 (v' = 0, 1, 3) has been determined.The laser system used in this experiment is CR899-29 laser system. It is a continuous wave ring laser, which can work in both dye and Titanium. It can sweep a large range automatically. So it is a powerful and effective tool in studying high resolution atom and molecule laser spectra. Here we make a thorough introduction to CR899-29 Titanium laser system, which is used for the first time in our laboratory, including principals and structures.The signal-to-noise ratio is improved with the magnetic rotation spectroscopy. However it makes the lineshape more complex, the intensities of spectra are also changed. We calculate the intensities of the vibrational rotational spectra and analyze the influence of Zeeman effect.
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