Experimental benchmarking of relative potential energy minima internuclear distances with femtometer length accuracy
The two-dimensional photon-excitation photon-emission (PhexPhem) map of the archetypal H_{2} molecule, constructed from dispersed-fluorescence measurements after energy-scanning excitation by small-bandwidth photons, displays complete systems of its Condon diffraction bands. They originate from spon...
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2025-04-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.7.023027 |
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| Summary: | The two-dimensional photon-excitation photon-emission (PhexPhem) map of the archetypal H_{2} molecule, constructed from dispersed-fluorescence measurements after energy-scanning excitation by small-bandwidth photons, displays complete systems of its Condon diffraction bands. They originate from spontaneous radiative dissociation of individual bound electronically excited rovibronic levels, one of the most relevant processes for the destruction of H_{2} in space. For the B-X system of electronic states, we show that specific measured spectral characteristics of individual bands are extremely sensitive to the difference ΔR of the internuclear distances, where the two potential energy curves each have their minimum. Using data from recorded H_{2}-PhexPhem maps, it is possible to experimentally validate the calculations of ΔR down to an accuracy of at least 50fm. This accuracy may be used as a sensitive experimental test to calculational accuracy. It is well feasible to improve the currently achieved experimental accuracy, for an even more accurate benchmark of advanced potential energy curve calculations. |
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| ISSN: | 2643-1564 |