High-Resolution Study of theX22Π3/2→X12Π1/2Fine Structure Transitions of PbF and PbCl

High-resolution Fourier-transform study of the X22Π3/2→X12Π1/2 fine structure transitions of PbH and PbD

“…Using the well known isotope relations [15] it is estimated that for lines with J 6 20 the rotational isotope effect for the three most abundant lead isotopes is less than the minimum line half-width in the high-resolution spectra of 0.015 cm À1 . However, like in the previously studied spectra of PbF [12] and PbLi [13], the lines of 207 PbH( 207 PbD) are split into two hyperfine structure components showing up as weak satellites on both sides of the superimposed rotational lines of 208 PbH( 208 PbD) and 206 PbH( 206 PbD). Fig.…”

“…3, traces c and d). Analysis of the spectra followed the lines described in our recent work on the analogous transitions of PbF and PbCl [12]. The lines of the strong 0-0 bands of 208 PbH, 207 PbH, 208 PbD, and 207 PbD were analyzed as fine structure transitions in the X 2 P r , v = 0 states using a Hund's case (a) formalism.…”

“…The absolute accuracy of the measurements is thought to be better than 0.003 cm À1 while the relative precision within the wavenumber range of a band is of the order of 10 À5 -10 À4 cm À1 . Most spectra were measured with lead of natural isotopic composition, but high-resolution spectra could also be measured with a left-over of isotopically enriched 207 Pb (89%, %1 g) which previously had been used for measuring spectra of PbF and PbCl [12]. Fig.…”

“…During the last years, we have reported Fourier-transform emission measurements of fine structure transitions in the X 3 R À or X 2 P ground states of a large number of Bi, Te, and Pb containing molecules (BiX, TeX (X = H, F, Cl, Br, I) [8], BiY (Y = O, S, Se) [9], Pb 2 [10], PbX (X = F, Cl, Br, I) [11,12]). In fact, PbH was the only species of these groups for which the fine structure transition had not been observed in spite of some experimental efforts.…”

The pure rotational spectra of the open-shell diatomic molecules PbI and SnI

“…To date only PbF and PbCl have been studied using high-resolution spectroscopy allowing information regarding their hyperfine structure to be obtained and examined to find suitable energy levels for the study of charge parity violation. [6][7][8] With the aim of expanding our knowledge of metal halides that have potential to be used for the study of the eEDM, we have carried out a microwave spectroscopy investigation of PbI and SnI. The electronic structure of the system PbI has been the subject of many spectroscopic studies since the 1940s.…”