Candan, I; (2016) Production and measurement of H2 in rovibrationally excited states. Masters thesis , UCL (University College London).

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Abstract

This work describes experiments conducted to achieve a stimulated Raman pumping (SRP) scheme for the state-selective detection of decelerated H2 molecules from a molecular beam. An optical Stark deceleration technique is proposed consisting of trapping H2 molecules in optical lattices. To achieve SRP, two separate experiments were carried out: a (2+1) resonance enhanced multiphoton ionization (REMPI) scheme and a coherent anti-Stokes Raman spectroscopy (CARS) scheme. The (2+1) REMPI experiment was conducted in a non-equilibrium DC glow discharge where ro-vibrationally excited H2 molecules at v = 1 are produced. We successfully measure the H2 (2+1) REMPI spectra at v = 1 vibrational state in this non-equilibrium discharge. In a separate CARS experiment, in which one of the lattice beams is used as a Stokes beam, we verify the pump laser wavelength for the SRP scheme. The outcome of both CARS and REMPI experiments shows good verification of the pump and probe wavelengths respectively. Furthermore, radial temperature measurements for H2 molecules are conducted in the non-equilibrium DC glow discharge using the (2+1) REMPI process. In this experiment, radial vibrational temperature of hydrogen molecules is measured to be over thousands of Kelvin for the first time. The rotational and translational temperatures are determined to be hundreds of Kelvin in these measurements as well.

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