Lifetime and diffusion distance of singlet oxygen in air under everyday atmospheric conditions

Abstract

<p>The lifetime and diffusion distance of singlet oxygen in air at 23 °C under 1 atm are 2.80 seconds and 0.992 cm, far longer than previously reported.</p>

Supramolecular Control of Singlet Oxygen Generation

“…On the other hand, 1 ∆ g is significantly long-lived as 1 ∆ g → 3 ∑ g − is spin-forbidden, resulting in its metastability. This bears out in the measured lifetimes of this species ranging in 10 −3 to 10 −6 s in solution and typically in milliseconds in gas phase, and at times even extending into minutes [ 40 ].…”

Molecular Terms of Dioxygen and Nitric Oxide

“…Similar contributions in combination with spin-orbit coupling (SOC) perturbation are responsible for the anisotropy of electronic spin g-factor; they are rather important for the ground triplet state of dioxygen 3 O 2 ( 3 Σ g − ) and provide ESR signal deviation from the free-electron value (g e = 2.0023). This deviation is big for the perpendicular component of g-tensor (as much as g ⊥ = 2.0052 [3,22]), while g || is close to g e value [23,24]. These parameters were first obtained fro314 m the ESR spectrum of solid oxygen [3] and these parameters are supported by ab initio self-consistent field (SCF) calculations [22,24].…”

“…Electronic contribution (g r e -factor) being almost equal to −3.96 × 10 −4 for the O 2 ( 1 ∆ g ) state and simultaneously close to g r e -value for the ground dioxygen O 2 ( 3 Σ g − ) state causes some doubts in researchers since Equation (4) provides different origins for both states [13,20]. Indeed, only 3 Π g states of 1 O 2 can contribute to the g r e -value for the ground triplet dioxygen [22,25]. The excited O 2 ( 1 ∆ g ) is usually produced in the presence of great excess of the triplet ground state oxygen [9,27].…”

“…This deviation is big for the perpendicular component of g-tensor (as much as g ⊥ = 2.0052 [3,22]), while g || is close to g e value [23,24]. These parameters were first obtained fro314 m the ESR spectrum of solid oxygen [3] and these parameters are supported by ab initio self-consistent field (SCF) calculations [22,24]. The electronic spin g-factor is connected with the spin-rotational coupling constant (γ) approximation is well developed for the ground and excited triplet states 3 Σ − of dioxygen [24].…”

Covalent Functionalization of Melt-Blown Polypropylene Filters with Diazirine–Photosensitizer Conjugates Producing Visible Light Driven Virus Inactivating Materials.

“…The lifetime of the 1 O2/ROS produced (µs to ms) limits the space in which inactivation may take place which we hypothesized would create layer at and above the material's surface that would inactivate any virus occupying that space. 34,35 The inactivation would then rely on pathogen diffusion in the transfer medium to within this concentrated 1 O2 area on the MBPP-3 surface and was therefore expected to present a time-dependence. Virus inactivation testing was then completed using a minimal volume of carrier medium to mimic aerosolized and droplet capture by the filter.…”