Abstract
The pendular spectra of linear ${({\rm HCCCN})_n}\;({\rm n} = {1 {-} 3})$ molecules at several rotational temperatures under a certain range of electric field strength $E$ are calculated using the finite element matrix diagonalization method. In addition, the normalized “$Q$-branch” intensity $({I_Q})$ and the gradient $({K_E})$ of ${I_Q}$ under corresponding conditions are investigated. Based on the results, the range and sensitivity of measuring the electric field strength with linear ${({\rm HCCCN})_{n\:}}({\rm n} = {1 - 3})$ molecules are analyzed. A scheme to measure electric field strength based on ${({\rm HCCCN})_{n\:}}({\rm n} = {1 - 3})$ with high sensitivity is proposed and the spatial resolution is also discussed. The feasibility of measuring the electric field strength of the electrostatic Stark decelerator based on a pendular spectrum is studied.
© 2021 Optical Society of America
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