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Thallium monofluoride (TlF) is a prime candidate molecule for precision measurements aimed at discovering new physics. Optical cycling on the B $leftarrow$ X transition around 271 nm enhances this potential. Hyperfine resolved ultraviolet spectra have been reported to determine the degree of rotational level mixing in the B-state and the efficiency of laser cooling on the B $leftarrow$ X transition [E. B. Norrgard ${it et~al.}$, Physical Review A ${bf 95}$, 062506 (2017)]. Using these high-resolution spectra, the hyperfine structure in the B-state of TlF is re-analysed and the magnitude of the $Lambda$-doubling in the B-state is discussed.
The B^1Pi <- X^1Sigma^+ system of NaCs molecule is investigated experimentally by polarization labelling spectroscopy technique. The inverted perturbation approach method is used to construct the potential energy curve of the B^1Pi state, providing a
The effects of final state interactions (FSI) in hadronic B-decays are investigated. The model for FSI, based on Regge phenomenology of high-energy hadronic interactions is proposed. It is shown that this model explains the pattern of phases in matri
Following the recent work of Eriksen et al. [arXiv:2008.02678], we report the performance of the textit{Configuration Interaction using a Perturbative Selection made Iteratively} (CIPSI) method on the non-relativistic frozen-core correlation energy o
Polarisation labelling spectroscopy technique was employed to study the 3$^{1}Pi_{u}$ state of Cs$_2$ molecule. The main equlibrium constants are $T_e=20684.60$cm$^{-1}$, $omega_e=30.61$cm$^{-1}$ and $R_e=5.27$r{A}. Vibrational levels $v=4-35$ of the
Recently found accelarated expansion of our Universe is due to the presence of a new kind of matter called $Lambda$ - field or quintessence. The limitations on its equation of state are found from the fact of its unclustering at all scales much small