Laser spectroscopy of the B[21.68]8–X8, B′[21.65]8–X8 and C[22.3]7–X27 transitions of holmium monofluoride

Laser spectroscopy of the A[16.4]8.5–X7.5, A[16.4]8.5–Y[0.15]8.5, and A[16.4]8.5–Z[0.85]7.5 transitions of dysprosium monochloride

“…However, for DyCl, the situation is reversed and the lowest state, X = 8. 5, of the f 10 s configuration is predicted to lie about 290 cm À1 below the lowest, X = 7.5, state of the f 9 s 2 configuration. Previous laser spectroscopy experiments have confirmed the predicted configurations of the low lying states of DyF [6] but there were no available experimental data on DyCl.…”

“…This is a simplistic description of LFT as, in reality, all the states are admixtures of more than one configuration but this simple approach does allow us to predict the expected molecular states. Most recently, we have reported results of our investigation of the holmium monochloride, HoCl, [2,3] and holmium monofluoride, HoF, [4,5] molecules. For both of these molecules, the ground state configuration was found to be Ho + (f 10 s 2 )X À in agreement with LFT predictions.…”

Hyperfine structure in the X8, A[19.1]9 and B[21.68]8 states of HoF and X8 and A[15.6]9 state of HoCl

“…Holmium (Ho) is a prime candidate among the lanthanides as it has a single isotope with nuclear spin I = 7/2 and a very large magnetic moment. An important portion of these studies has therefore been devoted to holmium-containing molecules, HoO [1][2][3][4], HoS [5,6] and the halides HoF [7,8] and HoCl [9,10]. For HoO and HoS, the eight hyperfine components of the rotational lines in the observed electronic transitions were well resolved even at the Doppler limited resolution ($900 MHz) in a Broida oven.…”

“…Using LIF techniques, we recorded many bands of the A-X system at higher resolution [7] and the analysis supported the previous X assignments. In a second LIF experiment [8], we examined the B-X region and observed and rotationally analyzed several bands which we assigned to three separate electronic transitions. Although hyperfine structure was not resolved at the Doppler limited resolution ($900 MHz) of the Broida oven, there was considerable broadening of the rotational lines, especially at low J, in some of the bands.…”

“…As a result, the old B-X 1-0 band was reassigned as B [21.68]8-X8 0-0 and the 2-0 band was assigned as the 0-0 band of a new B 0 [21.65]8-X8 transition. A third X = 7-7 transition was observed which did not involve the ground state and was labeled C[22.3]7-X 2 7 [8].…”