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Features Include :
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Available in
kinetic mode or spectral mode: LP920-K, LP920-S
respectively
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Minimum ∆OD
= 0.002 single shot kinetic mode
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Minimum ∆OD
= 0.0005 single shot spectral mode
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Transients
from 7ns to seconds
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Spectral
range 185-2000nm kinetic mode
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Spectral
range 185-930nm spectral mode
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Fully
computer controlled through Windows software
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∆OD
calculation, numerical fits by Marquardt-Levenberg
algorithm, time resolved absorption spectral
The LP920 uses the same basic
optical-electrical setup for operation in both Kinetic
and the Spectral Mode i.e. laser excitation source,
probe source, sample compartment,
monochromator/spectrograph, and control electronics. The
difference between the two modes is the detector and the
data acquisition electronics. In kinetic mode, a
photomultiplier detector or InGaAs PIN detector is used and
the transient acquired using a fast, high resolution
oscilloscope. In Spectral mode an array detector is fitted
to the spectrograph exit port to measure a full range of
wavelengths simultaneously. The array detector is a ICCD
camera with an integrated gated image intensifier (ICCD).
The PMT based LP920-K has a spectral response from
200-850nm. For transient studies in the spectral range 900
– 2000nm we can integrate an InGaAs PIN
photodiode.
The configuration of the LP920
consists of the following hardware :
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Flashlamp pumped Q-switched Nd:YAG
laser (a laser system can be supplied by Edinburgh
Instruments or alternately supplied by the customer)
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Pulsed / CW 450 W xenon arc lamp,
10Hz to single shot operation
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versatile sample chamber with
integral controller, high speed pump and probe port
shutters, sample holder, filter holders
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Emission monochromator /
spectrograph: 300mm focal length, Czerny-Turner design
triple grating turret facility with computer controlled
wavelength selection and computer controlled
continuously adjustable slits. Stray light rejection
1:105 , resolution down to 0.05nm
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single photon counting stop
photomultiplier or Image intensified ICCD camera
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fast, high resolution oscilloscope
(for kinetic mode operation)
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Dedicated PC running L900 software
for comprehensive spectrometer control, performance
monitoring, data acquisition and analysis library.
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Optional pump pulse energy monitoring is available
Software Interface :
The
LP920-K and the LP920-S are supplied with the L900
software package. This comprehensive Windows software
package controls both spectral and kinetic mode operation.
This L900 software in conjunction with the LP290
controller ensures the correct time sequencing of the
individual spectrometer components i.e. pump laser, probe
laser, spectrograph, pump and probe port shutters. A
variety of different measurements and correction methods
are available, Data averaging can be made either within
the digital storage, or on the ICCD chip in order to make
effective use of high repetition rate sources, or
transferred to the computer memory and averaged there.
At the end of a measurement sequence, the raw data is
converted into optical density data.
The L900 software package offers a comprehensive library
of data analysis routines.
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System Flexibility :
The emission monchromator / spectrograph
is fitted as standard with two exit ports allowing up to
two detectors to be fitted. A unique feature of the
monochromator is the computer controlled beam steering
mirror at this exit port, allowing rapid selection of
detectors (e.g. photomultiplier and Ge detector or single
element and array detector ) without the need for a
mechanical or optical adjustment. The monochromator also
has a computer controlled three grating turret which gives
maximum flexibility in wavelength coverage and spectral
resolution, for both the UV-VIS and near IR spectral
range.
The modular configuration of the LP920 spectrometer allows
a large number of accessories to be incorporated into this
system. Details of these accessories can be found here.
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