| Abstrakt: |
A Zeeman-tuned cw xenon laser differential absorption device is described. The xenon laser was tuned by axial magnetic fields up to 5500 G generated by an unusually large water-cooled dc solenoid. Xenon laser lines at 3.37 μ, 3.51 μ, and 3.99 μ were tuned over ranges of 6 Å, 6 Å, and 11 Å, respectively. To date, this apparatus has been used principally to study the details of formaldehyde absorption lines lying near the 3.508-μ xenon laser transition. These experiments revealed that the observed absorption spectrum of formaldehyde exhibits a sufficiently unique spectral structure that the present technique may readily be used to measure relative concentrations of formaldehyde in samples of polluted air. |
