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 Diagram of the experimental
apparatus of the laser-photolysis, cavity
ring-down, slow-flow reactor.
- Backflows of inert gas protect the cavity
mirrors from pollution. Although the
mirror reflectivity still degrades
slowly, cleaning restores performance
completely.
- The duration of a ring-down measurement
is much shorter than the chemical
reaction time.
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Flow Reactor Parameters:
- Time-scale of typical reaction = 0.1-100
milliseconds.
- Quartz Tube diameter = 16 mm ID.
- Flow velocity = 1-10 meter/second.
- Photolysis Laser Beam Length = 50 and 75 mm.
- Photolysis uniformity = +/-10%.
- Operational Pressures = 1-25 torr.
CRDS Parameters:
- Base Ring-down time = 1.8 microseconds.
- Cavity Length = 1.08 meter.
- Mirror radius = 1 meter.
- Typical mirror reflectivity = 99.6%.
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