# THE ELECTRIC DIPOLE MOMENT OF THE $\tilde{A}^{1}A_{2}$ STATE OF FORMALDEHYDE BY STARK QUANTUM BEATS

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 Title: THE ELECTRIC DIPOLE MOMENT OF THE $\tilde{A}^{1}A_{2}$ STATE OF FORMALDEHYDE BY STARK QUANTUM BEATS Creators: Carrera, Martin; Vaccaro, P. H.; Dai, H. L.; Field, R. W. Issue Date: 1983 Publisher: Ohio State University Abstract: Low-J rotational levels in the $V_{4} - 2$ vibrational level of the $H_{2}CO\tilde{A}^\pm A_{2}$ state are excited by a Nd:YAG pumped frequency-doubled dye laser. An electric field is applied in a direction perpendicular to the linear laser polarization. Quantum beats are observed between $|M|$ and $|M\pm2|$ levels originating from the same $J_{ka}, K_{c}$ asymmetry component. The electric field is varied over the interval 1 to 5kv/cm and quantum beats in the 4-40 MHz range are observed with an accuracy of $\pm 0.02$ MHz. The dependence of the measured Stark coefficient on J and $K_{a}$ is a probe of Coriolis perturbations within the $\tilde{A}$ state and Interactions between the prepared $\tilde{A}$ level and the ""lumpy continuum"" of the $\tilde{X}$ state. Description: Author Institution: Department of Chemistry, Massachusetts Institute of Technology URI: http://hdl.handle.net/1811/11908 Other Identifiers: 1983-RF-09