High-Resolution Laser Spectroscopy of the Ã2B2–X̃2A1 and B̃2B1–X̃2A1 Systems of SrNH2

Rotational analysis of the transition of SrNH2

“…Theà 2 B 2 andB 2 B 1 states of both CaNH 2 and SrNH 2 have been shown to interact strongly via a Coriolis-type interaction [9,10,12]. Therefore, the A rotational constant is affected, resulting in a value that implies a greater structural change than expected.…”

“…Strontium amide is a planar, near prolate asymmetric top molecule with C 2v symmetry [12,16]. The dipole moment lies along the a molecular axis (strontium-nitrogen bond), which gives rise to the selection rule DK a = 0.…”

“…Using the approximate band center from the previous low resolution work [12], a high resolution spectrum of theC 2 A 1 -X 2 A 1 transition of SrNH 2 was measured. Thẽ C 2 A 1 state correlates to a 2 R + state in the linear limit, such as the B 2 R + state of CaF [11].…”

“…While second order contributions to the B and C rotational constants are also possible, they were found to be less than the experimental error for theà 2 B 2 andB 2 B 1 states of CaNH 2 and SrNH 2 . In theC 2 A 1 state of CaNH 2 , again the second order contributions to the three rotational constants were found to be minimal and therefore neglected [11]; [12]. However, in each case only one isotopologue was observed, therefore the N-H bond length was fixed to that of NH 2 À (1.041 Å ).…”

“…In addition, the dipole moment in the ground state of CaNH 2 was measured using optical Stark spectroscopy [9]. For strontium amide, theà 2 B 2 -X 2 A 1 and B 2 B 1 -X 2 A 1 transitions have been rotationally analyzed using high resolution laser spectroscopy, while thẽ C 2 A 1 -X 2 A 1 transition has been observed only at low resolution [12]. Finally, the pure rotational spectra of magnesium, calcium, and strontium amides have been recorded along with their deuterium isotopologues [13][14][15][16].…”