The diode laser spectrum of three isotopic forms of PbH in its 2Π12 ground state

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

“…The latter finding reflects the fact that the X 2 potential curve dissociates into a fine structure component of the lead atom lying 7819 cm À1 higher than that correlated with the X 1 1/2 state (Pb( 3 P 1 ) + H( 2 S 1/2 ) vs. Pb( 3 P 0 ) + H( 2 S 1/2 )) [4]. The rotational constants of X 1 are found to be in good agreement with the results of Magg and Jones [5] (Table 7), the small differences in some parameters likely are due to the fact that these authors used some additional higher order terms in their analyses.…”

“…6.0(4) 0.82 (9) 10 6 a p3/2 À2.6(5) À0.08 (8) r e (Å) 1.83929 (2) 1.81719 (2) 1.838335 (12) 1.817021 (12) a Numbers in parentheses are the statistical error limits in units of the last digit. b Numbers in italics are the results of Magg and Jones [5] given for comparison.…”

“…1) and first hotband (1 ? 2) in the ground states of three isotopic forms of PbH by Magg and Jones [5]. Their work has yielded accurate vibrational and rotational constants of the X 1 1/2 state including K-doubling parameters.…”

Hydrides of the Main-Group Metals: New Variations on an Old Theme

“…The example of the indium hydride complex illustrates too that hydride ligands bound to maingroup metals do not generally share with those bound to transition metals the property of resonating at a distinctively low frequency. 2 The quadrupolar character of several of the key metal nuclei (e.g., 27 Al, 69 Ga, and 71 Ga) has also impaired the usefulness of these nuclei as NMR probes for hydride derivatives of the relevant metals in any but the most sym-metrical environments (e.g., AlH 4and GaH 4 -). 153,193,194 Systems which have attracted spectroscopic investigation, frequently together with colligative measurements, include ether solutions of the following species: (i) the magnesium hydrides RMgH, RMg 2 H 3 , and HMgX (R ) Me, Et, Pr i , Ph, or Cp; 195 X ) Cl or Br 196 ); (ii) AlH 3 ; 197 and (iii) the bi-and trimetallic species LiMgH 2 R, 15 LiMg 2 H 3 R 2 , 15 Li 2 MgH 2 R 2 , 15 HMg-MH 4 (M ) B or Al), 196,198 Mg(AlH 4 )(BH 4 ), 196,198 LiZnMe 2 AlH 4 , 199 and LiZn 2 Me 4 AlH 4 .…”

“…As yet, however, no lead(IV) hydride has yielded to structural authentication and experiment gives no guide to the dimensions of PbH n units, with the single exception of the gaseous PbH radical. 27…”