Bound, even-parity $J = 0$ and $J = 2$ spectra of Sr

Extensive new data on the even-parity,

J = 0

and

J = 2

states of Sr have been obtained using multiphoton ionization spectroscopy. Revised term values for previously observed

5 s 9 d {}^{1}D_{2}

and

{}^{3}D_{2}

, and

5 s 13 d

5 s 16 d {}^{3}D_{2}

states are presented in addition to term values for newly observed

{}^{1}S_{0}

states up to

5 s 21 s

{}^{1}D_{2}

states up to

5 s 60 d

, and

{}^{3}D_{2}

states up to

5 s 37 d

. The new data clearly show an avoided crossing between the

{}^{1}D_{2}

and

{}^{3}D_{2}

series near the

5 s 16 d

levels. A strong

J = 2

autoionizing resonance is also observed, ∼450

{cm}^{- 1}

above the first ionization limit. Multichannel quantum-defect theory (MQDT) parametrizations of the

{}^{1}S_{0}

{}^{1}P_{1}^{o}

{}^{1}D_{2}

, and

{}^{3}D_{2}

bound-state Rydberg series are also presented, including calculated term values for these series. The MQDT analysis of the

J = 2

series in Sr differs from the earlier analysis of Ca in that both configuration interactions and recoupling between

{}^{1}D_{2}

and

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Bound, even-parityJ=0andJ=2spectra of Sr