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• W2077908039 abstract "Experimental.---The investigation of the Zeeman effect in the MgH $^{2}ensuremath{Pi}ensuremath{rightarrow}^{2}ensuremath{Sigma}$ bands at 7 field strengths between 5,000 and 28,000 gauss is described. The bands were produced by a Mg arc, operating in hydrogen. A powerful magnet, equipped with a Back-box, was used in conjunction with a 21-foot concave grating.Calculation of Zeeman patterns.---With the use of the results obtained by Hill in the preceding article, theoretical patterns for representative lines in the band are plotted. Thus in the ${P}_{1}$ and ${Q}_{1}$ branches the first line should become in the field a sharp doublet of separation $2ensuremath{Delta}{ensuremath{nu}}_{n}$; the second a pair of quartets, one on either side of the no-field position of the line; the third a pair of sextets similarly situated. For the higher lines considered only the extreme energy levels ($M=ifmmodepmelsetextpmfi{}J$) and zero lines ($M=0$) are obtained from which the appearance of the unresolved patterns may be predicted. In general for these lines a no-field doublet consists in the field of a central band filling the no-field interval and two outer components or wings, one on either side.Comparison of observed patterns with theory.---A detailed description of the observable patterns in the band $ensuremath{lambda}5211$ and a quantitative comparison with the theory are put in tabular form. The first lines show a fine structure in good numerical agreement with the calculations, while for the higher doublets the unresolved patterns correspond closely to those predicted. In the latter case, a central band practically fills the no-field interval, its intensity increasing with the field. The wings become more widely separated and less intense, approaching the separation $4ensuremath{Delta}{ensuremath{nu}}_{n}$ as the Paschen-Back effect begins.Numerical intensity calculations have not been made but certain observations on intensities are correlated (1) with the distribution of components in the theortical patterns, (2) with the relative orientations of spin and magnetic field in the two states of the molecule. The most clean-cut observation on intensities fitting in with the theory is the decrease in the intensity of the wings relative to that of the central band as the Paschen-Back effect begins. Then only transitions for which $ensuremath{Delta}{M}_{s}=0$ have an appreciable probability. These give the central band, whereas $|ensuremath{Delta}{M}_{s}|=1$ corresponds to the wings, whose intensity is correspondingly small." @default.
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• W2077908039 date "1929-12-15" @default.
• W2077908039 modified "2023-09-25" @default.
• W2077908039 title "The Zeeman Effect in the MgH Bands" @default.
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• W2077908039 doi "https://doi.org/10.1103/physrev.34.1517" @default.
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