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Forbidden_Transition

Kieran F. Thomas, Jacob A. Ross, Bryce M. Henson

Analysis code for an experimental measurment of the 427 nm 23S1 -- 33S1 highly forbidden transition in metastable helium.

Level Diagram of He*
Figure 1- Level diagram of He* showing the forbidden 427nm transition.

A write up of the results of this experiment can be found at https://arxiv.org/abs/2002.04811.

Direct detection scan*
Figure 2- Normalised detected number of scattered atoms against probe frequency where f0,d== 700, 939, 271.64(8) MHz, Fig. 3 in https://arxiv.org/abs/2002.04811.

The results of the direct detection method showin in Figure 2 are produced with the file 'fig_direct_scan.m', while the center frequency can be calculated with 'calc_freq.m'. The Einstein A coefficent fro the 23S1 -- 33S1 can be calculated from our data using the file 'calc_A.m', and the excited state lifetime of the 33S1 state can be derived from our data using the file 'calc_tau.m'. All other figures presented in the paper can also be generated with their corresponding 'fig_' .m file.

Install

git clone --recurse-submodules -j8 https://github.com/KF-Thomas/Forbidden_Transition.git

then to update

git submodule update --init --recursive --remote --merge

Running

The code only requires MATLAB to run. Note that it does need all subdirectories to be added to the current path in order to exectue properly.

Contributions

This project would not have been possible without the many open source tools that it is based on. In no particular order:

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