Optical–optical double resonance laser spectroscopy of BaO
| Autor: | Robert W. Field, Michael A. Revelli, Gene A. Capelle |
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| Rok vydání: | 1975 |
| Předmět: | |
| Zdroj: | The Journal of Chemical Physics. 63:3228-3237 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.431813 |
| Popis: | BaO molecules were sequentially excited by collinearly propagating radiation from two cw lasers, an argon ion laser (488.0 and 496.5‐nm lines) and a tunable (560–630 nm) rhodamine 6G dye laser. This sequential excitation technique, called optical–optical double resonance (OODR), is a special case of two‐photon spectroscopy in which two visible or uv wavelength photons of different frequencies resonantly excite a molecule from an initial level (v″,J″) to a final level (v*,J*) by way of a real intermediate level (v′,J′). Two types of optical double resonance experiments were performed on BaO. The first, excitation spectroscopy, revealed 19 vibronic levels of 1Σ+ electronic symmetry between 36 490 and 38 620 cm−1 above E (X 1Σ,re). These 19 1Σ+ levels belong to two or more perturbed electronic states. No 1Π levels were found, although levels belonging to the upper state of the BaO B (1Π) –X 1Σ Parkinson bands occur in this energy region. The second type of experiment, photoluminescence spectroscopy, enabled ... |
| Databáze: | OpenAIRE |
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