A new electronic transition in gaseous PtC

Nuclear hyperfine structure in the X3Σ+ state of 91ZrC

“…The most important of these distant states will be the 1 P and 3 P i states from the configuration (5sr) 1 (2pp) 3 but, interestingly, they make only a small contribution to k. There are two reasons. One is that the spin-orbit parameter involved is that for a carbon 2p orbital, which is only 29 cm À1 [32]; the other is that the shifts caused by the spin-orbit operator are almost the same for 3 R 0 and 3 R 1 .…”

“…One is that the spin-orbit parameter involved is that for a carbon 2p orbital, which is only 29 cm À1 [32]; the other is that the shifts caused by the spin-orbit operator are almost the same for 3 R 0 and 3 R 1 . Writing the electron wave functions for the states from the configurations (5sr) 1 (2pr) 1 and (5sr) 1 (2pp) 3 as Slater determinants, it can be shown that the spinorbit matrix elements are…”

“…Unusually for a 4d transition metal compound, the 3 R ground state is very close to HundÕs case (b) coupling. The strongest bands of ZrC lie in the 16 500-17 500 cm À1 region, and for some of them it is possible Table 1 Rotational constants (cm À1 ) for the 3 (7) Error limits are 3r, in units of the last significant figure quoted. a Calculated from the value for 90 ZrC, using the isotope relations.…”

“…The first spectrum of a monocarbide, that of PtC [1], was found by Scullman and her group in 1965, using a high-temperature King furnace; spectra of RhC, IrC, and RuC followed during the next seven years [2][3][4][5][6][7][8][9][10] though it was not always possible to determine the symmetries of the states involved because of the density of the rotational structure. No further discoveries were made until 1994, when Simard et al [11] reported the spectrum of YC.…”

Electronic transitions of cobalt carbide, CoC, near 750 nm: A good example of case (bβS) hyperfine coupling

“…For many years the rotational analyses of the electronic spectra of PtC, [1][2][3] RhC, 4 -6 IrC, 7,8 and RuC ͑Refs. 9 and 10͒ by Scullman and co-workers at Stockholm gave the only structural data available for diatomic metal carbides.…”