Table of Contents
Advertisement
System Description
112
Spectrometer
Polychromator: The high energy (f/6.7) echelle-based polychromator is a
PerkinElmer design. The resolution of the system is 0.006 nm at 200 nm. The 80
by 160 mm echelle grating has 79 lines per mm and a blaze angle of 63.4 degrees.
On the Avio 500, the cross disperser for the UV region is a grating (374 lines/mm)
with Schmidt correction incorporated into its surface. The Schmidt correction
performs aberration correction for the 400 mm radius camera sphere.
The cross disperser for the visible region on dual detector mode is a 60-degree
prism.
The entire optical system is enclosed in a purged and thermostated optical
enclosure.
Thermostating: The polychromator is thermostated to 39 °C. The thermostating
includes the transfer optics along with the polychromator.
Plasma Viewing: The viewing position can be optimized by the software with all
configurations.
Shutter and Mercury Recalibration System: The computer-controlled motor
operated shutter automatically opens and closes for each sample. By closing the
shutter between each sample, the first transfer mirror is protected from long
exposures to the intense UV radiation of the plasma thus extending the useful
lifetime of the mirror. A mercury lamp is built into the entrance shutter mechanism
and can be viewed when the shutter is closed to monitor the mercury emission line
at 253 nm and automatically update the system wavelength calibration. Frequency
of the automatic recalibration is user selectable between 0 and 1000 minutes and
can be varied during an autosampler analysis.
Detector: The patented PerkinElmer Segmented-array Charge-coupled-device
Detector (SCD)
Electronics: Correlated double sampling data acquisition electronics reduce
electronic noise.
Advertisement
Table of Contents
Troubleshooting
