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Solvent Effects on the O2(a1g) → O2(b1\(\Sigma_{\text{g}}^{ + }\)) Transition

  • Mikkel BregnhøjEmail author
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Part of the Springer Theses book series (Springer Theses)

Abstract

In contrast to the O2(b1\(\Sigma_{\text{g}}^{ + }\)) → O2(X3\(\Sigma_{\text{g}}^{ - }\)) and O2(a1g) → O2(X3\(\Sigma_{\text{g}}^{ - }\)) transitions, the O2(b1\(\Sigma_{\text{g}}^{ + }\)) → O2(a1g) transition is not forbidden by the selection rule for spin, only those regarding parity, symmetry, and angular momentum [1]. As such, this transition is presumably stronger and more readily detected in a spectroscopic experiment. Unfortunately, the transition falls in a spectral region (~1920 nm, ~5200 cm−1), where fast photomultiplier tubes generally do not function, and we have to rely on slow and insensitive semiconductor devices to detect the desired signal. Therefore, the inherently short lifetime of O2(b1\(\Sigma_{\text{g}}^{ + }\)) in solution limits the range of systems where O2(b1\(\Sigma_{\text{g}}^{ + }\)) → O2(a1g) fluorescence can be detected with time-resolution [2].

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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of ChemistryAarhus UniversityAarhusDenmark

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