Fully resolved Zeeman pattern in the Stern-Gerlach deflection spectrum of O 2 ( 3 </mml:…
1988; American Institute of Physics; Volume: 38; Issue: 2 Linguagem: Inglês
10.1103/physreva.38.737
ISSN0556-2791
AutoresN. A. Kuebler, M. B. Robin, J. J. Yang, Aharon Gedanken, D. R. Herrick,
Tópico(s)Spectroscopy and Laser Applications
ResumoThe Stern-Gerlach magnetic deflection spectrum of a molecular beam of $^{16}\mathrm{O}_{2}$ cooled by supersonic expansion to its lowest rotational level (K=1) reveals nine spatially separated peaks within a span of 2 cm. These peaks readily are assigned from a calculation of the Zeeman energies of the K=1 spin-rotation sublevels characterized by ${M}_{J}$, and the assumption of a uniform field gradient within the deflecting magnet gap. However, the variable widths of the observed peaks and the decreasing deflection of certain ${M}_{J}$ peaks with increasing field above 14 kG require the explicit consideration of field-gradient inhomogeneities. The theory for this is developed and the spectral profiles again computed with field-gradient inhomogeneity and rotational temperature (${T}_{\mathrm{rot}}$) as variables. Agreement of the theoretical shifts, bandwidths, and relative intensities with increasing field gradient when compared with the experimental spectra is very good, and ${T}_{\mathrm{rot}}$ is found to be 3.5 K. The deflection spectrum of a beam of $^{17}\mathrm{O}_{2}$ differs from that of $^{16}\mathrm{O}_{2}$, reflecting the population of the K=0 rotational level in the $^{17}\mathrm{O}_{2}$ isotopomer. The oxygen dimer and trimer appear to be paramagnetic, but this result is tentative.
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