A buffer gas cooled molecular beam apparatus for chirped pulse millimeter wave spectroscopy
Name
921140858-MIT.pdf
Description
Full printable version
Size
4.79 MB
Format
Adobe PDF
Checksum (MD5)
1d25396fc857ed653e98ae4d50f50c16
Author(s)
Klein, Ethan Avram
Advisor(s)
Robert W. Field.
Date Issued
2015
Publisher
Massachusetts Institute of Technology
Abstract
An apparatus that utilizes buffer gas cooling to produce slow atomic (Ba, Ca) and molecular (BaF, CaF) beams is constructed. In-cell temperatures of 20 ± 0.25K are achieved with chamber cooldown times of under two hours. Laser Induced Fluorescence (LIF) spectra of BaF and CaF confirmed thermalization of the molecular beam to the temperature of the buffer gas and additional hydrodynamic cooling to rotational and translational temperatures under 10K. Laser fluence effects on the intensity of barium and calcium ablation were studied and used to optimize laser parameters for maximum ablation of the desired species. A chirped pulse millimeter wave (CPmmW) setup was combined with the buffer gas cooling apparatus for combined laser and millimeter wave spectroscopy experiments of Rydberg states. LabVIEW programming is used for an internal temperature feedback system, raster scanning of the ablation target, as well as millimeter wave FID signal digital acquisition. Use of the apparatus for chirped pulse microwave spectroscopy of buffer gas cooled beams have led to orders of magnitude improvement in both the resolution and the reduction of time required to record molecular Rydberg spectra.
Description
Thesis: S.B., Massachusetts Institute of Technology, Department of Chemistry, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 34-36).
Subjects
Chemistry.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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