Laser photoluminescence of zirconium oxide at 4 K

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Abstract
Laser induced photoluminsecence spectra of ZrO trapped in Ne at 4 K have been obtained. Continuous wave tunable dye and cw argon ion lasers were used to excite ZrO from the X 1Σ+ ground state to the e 1Π and B 3Π electronic states, respectively. Red emission from e 1Π (v=0) →X 1Σ+(v=0,1,2) was observed. In addition, e 1Π (v=0) and e 1Π (v=2) have been found to undergo matrix induced intersystem relaxation into the E 3Π and A 3Φ states, respectively. Infrared emissions of ZrO have been observed and tentatively identified as belonging to E 3Π→X′ 3Δ and e 1Π→c 1Δ. Bandheads of observed transitions are shifted not more than 2% from known gas‐phase values. Line shapes of the transitions to the ground state from the e and B states are characterized by a sharp zero‐phonon line accompanied by a multiphonon sideband. An additional system overlapping the e 1Π−X 1Σ+ system has been observed and is identified as the A 3Φ2→X′ 3Δ1 band system. The energy of the low‐lying c1Δ and X′ 3Δ states are determined to be 5200 and 1650 cm−1 above the ground state.

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