Nuclear electric quadrupole moments of Rb from the hyperfine spectrum of RbF

Abstract

The molecular beam electric resonance technique has been used to examine the hyperfine spectrum of RbF. The Rb nuclear electric quadrupole interaction, the spin-rotation interactions, and tensor and scalar spin-spin interactions have been measured for both Rb isotopes, including their dependence on vibrational and rotational states. Transition frequencies have been determined to a precision of better than 1 Hz in many cases. The magnetic interactions in the two isotopomers are consistent with what is expected from the known masses and magnetic dipole moments. In the case of the Rb nuclear electric quadrupole interaction, adjustments have been made for a small isotopomer shift, and for the ratio of the effective nuclear electric quadrupole moments, Q(87Rb)Q(85Rb) = 0.483 830 1+/-0.000 001 8. The effective quadrupole interaction includes a pseudoquadrupole interaction that may be significant at this level of precision, but cannot be distinguished experimentally.

Hyperfine spectrum of RbI

“…One gives the ratio of the nuclear electric quadrupole interactions of the rubidium nuclei as eQq 00 ( 87 Rb)/ eQq 00 ( 85 Rb) = 0.4838262 ± 0.0000012. This is statistically nearly consistent with the values of 0.4838301 ± 0.0000018 and 0.483837 ± 0.000022 we previously reported for RbF [1] and RbCl [2], respectively. Any remaining discrepancy between these ratios could be due to a pseudoquadrupole interaction.…”

“…Molecules containing rubidium atoms also have hyperfine interactions that are best observed using the molecular beam electric resonance technique. Reports on our MBER measurements of the molecular effects in RbF and RbCl have been published previously [1,2]. In this paper we present our study of rubidium iodide, with 57 transitions observed and fitted for 85 Rb 127 I and 13 for 87 Rb 127 I.…”

Hyperfine spectra of KBr and KI

“…In this paper, we present the results of an examination of the hyperfine spectra of the molecules KBr and KI, continuing our extended investigation [1][2][3][4][5][6][7][8][9][10] of alkali halide molecules using an electric resonance molecular beam spectrometer. The experimental details as they relate to the current experiments are described in a document included in Supplementary material.…”

Year-2008 nuclear quadrupole moments

“…Das and Natarajan [46] report for 85,87 Rb 5p 2 P 3=2 states B values of 26.0084 (49) and 12.4970(35) MHz, respectively. Note that the 87/85 ratio is 0.48050, compared with the molecular ones of 0.4838301(18) and 0.483837 (22) for RbF [59] and RbCl [60], respectively.…”