Singlet molecular oxygen by direct excitation
Steffen Jockusch; Nicholas J. Turro; Elizabeth K. Thompson; Martin Gouterman; James B. Callis; Gamal E. Khalil
- Singlet molecular oxygen by direct excitation
Turro, Nicholas J.
Thompson, Elizabeth K.
Callis, James B.
Khalil, Gamal E.
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- Photochemical & Photobiological Sciences
- Direct excitation at 1064 nm and detection of singlet molecular oxygen at 1270 nm is made possible by the availability of powerful YAG-lasers and sensitive NIR photomultipliers. Singlet oxygen was generated in condensed phase at 77 K by direct excitation at 1064 nm (without the use of sensitizers). Several luminescing species were observed by time resolved luminescence spectroscopy and luminescence lifetime measurements, including the single molecule 1Î”gand 1 Î£g+states as well as luminescence from the [1Î”g]2 simultaneous transition. As an application we propose a novel method for obtaining quantitative non-intrusive mapping of the 2-D oxygen concentrations and pressure at cryogenic temperatures, which is of importance in aircraft design for high altitudes.
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