Molecule Number Determination of BaF in the NL-eEDM Experiment

Gkinopoulos, Konstantinos (2025) Molecule Number Determination of BaF in the NL-eEDM Experiment. Bachelor's Thesis, Physics.

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Abstract

This thesis discusses a new detection scheme proposed for the molecular number determination of barium monofluorine (BaF) in the NL-eEDM experiment. It presents the first experimental observation of the X2Σ(N= 0) →D2Σ+(N= 1) transition in BaF, a significant milestone in the spectroscopic investigation of this molecule. The transition was detected using laser-induced fluorescence in the molecular beam of the NL-eEDM setup, allowing for the confirmation of the theoretical predictions concerning hyperfine structure and state-selective excitation. This transition was observed at a frequency of 739.94638 THz with a hyperfine splitting of 66.4 ±1.1 MHz for the X2Σ+ ground state , consistent with the theoretical expectation of 65.9 MHz . A Voigt profile analysis was used to extract the convolution between the Lorentzian and the Gaussian contributions to the observed spectrum. Despite limitations in the laser intensity and optical beam quality, the measurements revealed the hyperfine splitting (F= 1 →F= 2) of the excited D2Σ+3/2 state at 5.3 ±1.3 MHz. A theoretical saturation intensity was calculated, while Doppler broadening was observed under near perpendicular laser beam geometry. Challenges such as limited signal-to-noise ratio, reduced photon efficiency and large shot to shot molecular number variations are discussed. This thesis outlines key improvements necessary for future precision measurements within the framework of the NL-eEDM experiment.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Willmann, L. and Jones, S.A.
Degree programme:	Physics
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	24 Jul 2025 10:17
Last Modified:	24 Jul 2025 10:17
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/36418

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