A new spectroscopic technique applicable to the detection of
ultra-weak and for- bidden molecular transitions is presented. The
method is based on o -axis integrated- cavity-output spectroscopy
(ICOS) and has been applied to the detection of singlet (a1 g)
oxygen in the (1,0) band of the electric-quadrupole allowed Noxon
system (b1 + g a1 g) of oxygen. The details of the method as well
as spectroscopic data con rming the absolute line positions of
twenty-one lines in the (1,0) band of the b1 + g a1 g have been
completed to within 0:004 cm 1. A Boltzmann analysis veri ed
previously calculated and unproven integrated cross sections for
each of the lines. Ten lines were also pressure broadened from 25
Torr to 100 Torr, and pres- sure broadening coe cients were
determined from -p = 3:61 10 6 cm 1=torr to 5:81 10 6 cm 1=torr.
These coe cients illustrate that rotationally-inelastic colli-
sions are the dominant mechanism in molecular pressure broadening.
The singlet oxy- gen was generated in a microwave plasma and the
afterglow passed through an o -axis ICOS measurement system
consisting of an 82 cm long, high- nesse (F 248000) optical cavity.
The mirror re-ectivity, R, was determined by performing a cavity-
ringdown measurement and observing ringdown times of 220 s in a
range from 1494 nm to 1512 nm.
General
| Imprint: |
Biblioscholar
|
| Country of origin: |
United States |
| Release date: |
October 2012 |
| First published: |
October 2012 |
| Authors: |
Jeffrey E Gallagher
|
| Dimensions: |
246 x 189 x 6mm (L x W x T) |
| Format: |
Paperback - Trade
|
| Pages: |
114 |
| ISBN-13: |
978-1-249-60044-2 |
| Categories: |
Books >
Social sciences >
Education >
General
|
| LSN: |
1-249-60044-8 |
| Barcode: |
9781249600442 |
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