Absorption and Laser-Excited Fluorescence of Matrix-Isolated CuO

Absorption and laser-excited fluorescence spectra of CuO trapped in variousmatrices have been observed. The matrix data and previously observed gas-phase data are consistent withν00 (martix)ν00 (gas)5ν (martix)(cm−1)(cm−1)(cm−1)(cm−1)C23 550B(2Σ?)20 49020 953624A(2Π?)3 9004 460605(2Π1/2 − 2Π3/2 = 275)X(2Π)00665(2Π1/2 − 2Π3/2 ≃ 200)for the lowest states of CuO. It is shown that the matrix-isolation technique can beused to “tune” an absorption into coincidence with a laser line in order to observefluorescence. The vibrational relaxation of CuO in a solid matrix requires on the order of 105 vibrations.