Kinetic study on the photoabsorption process of gaseous O2 dimol at 630 nm in a wide pressure range

Ida, Akira; Furui, Eiji; Akai, Nobuyuki; Kawai, Akio; Shibuya, Kazuhiko

doi:10.1016/j.cplett.2010.02.022

Cited by 9 publications

(8 citation statements)

References 31 publications

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“…Basically it is the dimol counterpart of the 1270 nm monomol transition (two 1270 nm photons have the same energy as one 633 nm photon), with an energy of 1.96 eV. This transition has been employed to assess physical and/or chemical parameters, mainly in high pressure oxygen although there are studies in organic solvents too [99], [101], [123], [173], [174], [175], [176].…”

Section: Direct Optical Excitation Of 1o2mentioning

confidence: 99%

Direct 1O2 optical excitation: A tool for redox biology

Blázquez‐Castro

2017

Redox Biology

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Molecular oxygen (O2) displays very interesting properties. Its first excited state, commonly known as singlet oxygen (1O2), is one of the so-called Reactive Oxygen Species (ROS). It has been implicated in many redox processes in biological systems. For many decades its role has been that of a deleterious chemical species, although very positive clinical applications in the Photodynamic Therapy of cancer (PDT) have been reported. More recently, many ROS, and also 1O2, are in the spotlight because of their role in physiological signaling, like cell proliferation or tissue regeneration. However, there are methodological shortcomings to properly assess the role of 1O2 in redox biology with classical generation procedures. In this review the direct optical excitation of O2 to produce 1O2 will be introduced, in order to present its main advantages and drawbacks for biological studies. This photonic approach can provide with many interesting possibilities to understand and put to use ROS in redox signaling and in the biomedical field.

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Section: Direct Optical Excitation Of 1o2mentioning

confidence: 99%

Direct 1O2 optical excitation: A tool for redox biology

Blázquez‐Castro

2017

Redox Biology

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“…We term such a band a twomolecule combination band, which is also known in the literature as a "dimol absorption band," dimol meaning "two-molecule." For example, see Ida et al (2010) and Tajti et al (2017). Previous identifications of twomolecule combination bands in spectra of ice samples include single photons exciting the fundamental mode of adjacent N 2 molecules (Grundy et al 1993) and adjacent N 2 and O 2 molecules (Minenko & Jodl 2006) as well as single photons exciting an electronic tran-…”

Section: Introductionmentioning

confidence: 99%

A New Two-molecule Combination Band as a Diagnostic of Carbon Monoxide Diluted in Nitrogen Ice on Triton

Tegler

Stufflebeam

Grundy

et al. 2019

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A combination band due to a mechanism whereby a photon excites two or more vibrational modes (e.g. a bend and a stretch) of an individual molecule is commonly seen in laboratory and astronomical spectroscopy. Here, we present evidence of a much less commonly seen combination band − one where a photon simultaneously excites two adjacent molecules in an ice. In particular, we present nearinfrared spectra of laboratory CO/N 2 ice samples where we identify a band at 4467.5 cm −1 (2.239 µm) that results from single photons exciting adjacent pairs of CO and N 2 molecules. We also present a near-infrared spectrum of Neptune's largest satellite Triton taken with the Gemini-South 8.1 meter telescope and the Immersion Grating Infrared Spectrograph (IGRINS) that shows this 4467.5 cm −1 (2.239 µm) CO-N 2 combination band. The existence of the band in a spectrum of Triton indicates that CO and N 2 molecules are intimately mixed in the ice rather than existing as separate regions of pure CO and pure N 2 deposits. Our finding is important because CO and N 2 are the most volatile species on Triton and so dominate seasonal volatile transport across its surface. Our result will place constraints on the interaction between the surface and atmosphere of Triton.

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“…According to [22], the concentration of O 2 (a):O 2 (a) pairs of two free molecules in which radiative transition (4) is possible is n aa = K(n a ) 2 , where K ≈ 1.47 × 10 -22 cm 3 at a temperature of about 300 K. Assume that the concentration of O 2 (a):O 2 (X) complexes consisting of two free molecules in which radiative process (2) is possible can also be determined as n aX = Kn X n a with the same value of the constant K. Then, for the radiative transition O 2 (a):O 2 (X) → O 2 (X):O 2 (X) + hν (1268 nm), which corresponds to CIE (2), the Einstein coefficient will be A aX = k С n a n X /n aX = k С /K ≈ 850A a ≈ 0.19 s -1 at A a = 2.19 × 10 -4 s -1 .…”

Section: Resultsmentioning

confidence: 99%

1.27-μm emission of O2(1Δ) induced by collisions with oxygen molecules

2015

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The intensities of collision-induced emission of singlet oxygen O 2 (a 1 Δ) caused by the following two radiative processes-O 2 (a, ν = 0) + O 2 (a, ν = 0) → O 2 (X, ν = 0) + О 2 (X, ν = 0, 1) + hν and O 2 (a, ν = 0) + O 2 → O 2 (X, ν = 0) + O 2 + hν-are studied by emission spectroscopy. It is found that the rate constants of these radiative processes are (1.54 ± 0.23) × 10 -22 cm 3 s -1 and (2.74 ± 0.4) × 10 -23 cm 3 s -1 , respectively.

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Kinetic study on the photoabsorption process of gaseous O2 dimol at 630 nm in a wide pressure range

Cited by 9 publications

References 31 publications

Direct 1O2 optical excitation: A tool for redox biology

Direct 1O2 optical excitation: A tool for redox biology

A New Two-molecule Combination Band as a Diagnostic of Carbon Monoxide Diluted in Nitrogen Ice on Triton

1.27-μm emission of O2(1Δ) induced by collisions with oxygen molecules

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