Paramagnetic Resonance Spectrum of the 1Δg Oxygen Molecule

Time-Resolved EPR Study of Singlet Oxygen in the Gas Phase

“…17 The reported EPR spectrum of O 2 ( 1 Δ g ) has four components whose origins are well understood on the basis of rotational spectroscopy. 8,14 Thus, the EPR of O 2 ( 1 Δ g ) can serve as a convenient fingerprint of this electronically excited molecule in the gas phase.…”

“…8−14 EPR of O 2 ( 1 Δ g ) was reported for the first time in 1965. 8 One communication presented data on the kinetics of O 2 ( 1 Δ g ) formation and decay in the gas phase measured by EPR in which its lifetime was τ = 7 s. 14 The contributions of different decay processes in the determined τ 14 remain unknown.…”

Reactive oxygen species: Reactions and detection from photosynthetic tissues

“…The radiative decay of 1 O 2 to ground-state O 2 yields luminescence with maximum at 1268 nm in the gas phase [26]; in water and deuterium oxide (D 2 O), the peak is at 1274 nm [27]. Although 1 O 2 is a singlet state, it has an EPR spectrum [28]. The spectrum has been detected only in the gas phase [29].…”

A Chemical Mechanism for Self-ignition in a Peat Stack

“…Singlet delta O 2 molecule has no unpaired electrons and therefore no net electron spin. The 1 Δ g has paired electrons, however it is paramagnetic as shown by the observation of an electron paramagnetic resonance (EPR) spectrum [12]. …”