Магнитоиндуцированные переходы в спектральной окрестности D-=SUB=-2-=/SUB=--линии атомов Cs: гигантский рост вероятностей переходов и различное асимптотическое поведение в растущем поперечном магнитном поле

Abstract

Two types of magnetically induced transitions (MI transitions) in cesium atoms have been studied experimentally and theoretically. In the absence of a magnetic field MI, transitions are forbidden. As the magnetic field increases, the probabilities of MI transitions grow rapidly and can exceed the probabilities of transitions allowed in the absence of a magnetic field. The asymptotic behavior of the probabilities of MI transitions in strong magnetic fields is different. In the case of magnetically-induced transitions of the first type (MI1), with an increase in the applied magnetic field, the probability of these transitions increases enormously, and with a further increase in the magnetic field, the probabilities of these transitions tend to a constant value. In the case of magnetically induced transitions of the second type (MI2), with an increase in the applied magnetic field, there is also a giant increase in the probability of these transitions; however, with a further increase in the field, the probabilities of these transitions again tend to zero. It is shown that measuring the second derivative (SD) of the absorption spectra of Cs vapors enclosed in a nanocell with a thickness of L = 426 nm, corresponding to half the wavelength of the D2 line of cesium λ = 852 nm, allows one to perform Doppler-free spectroscopy. The small width of atomic lines and the linearity of the SD signal response in accordance with the transition probabilities make it possible to study individual atomic transitions in an external transverse magnetic field with an inductance of 0.5 to 5.3 kG. In particular, four MI transitions were investigated: two MI1 and two MI2. The theoretical calculations are in good agreement with the experimental results