Options for transient absorption/laser flash photolysis spectrometers
Edinburgh Instruments has a range of accessories for the laser flash photolysis spectrometer. We will be very happy to discuss the best accessories for your application with you, so please do not hesitate to contact us for more information.
Lasers and OPOs
The LP920 laser flash photolysis spectrometers require a pump laser to operate. Generally the standard laser source used is a nanosecond pulsed Q-Switched Nd:YAG laser with its available harmonics as pump wavelengths (1064, 532, 355 and 266nm). Nd:YAG pump lasers can also be coupled to an OPO to create tunability over a wide range of wavelengths. The LP920 can operate with lasers/OPOs from many manufacturers such as SpectraPhysics, Continuum, Quantel, EKSPLA, Litron and OPOTEK. Some of these lasers can be directly controlled from the spectrometer software.
Other pump laser sources such as Dye Lasers and Excimer lasers can also be integrated and used with the LP920 series. Please contact Edinburgh Instruments Ltd for more details about pump lasers or for compatibility verification if you already have a laser available.
Sample measurement geometries
The standard sample measurement geometry is a cross-beam geometry, where laser beam and probe beam intersect perpendicular at the sample position. Should this geometry not be suitable for your application we can offer:
Diffuse Reflectance Option – a sample holder for solid, non-transparent samples to be measured in Laser Flash Photolysis. This option requires samples to show significant diffuse scattering.
Quasi Co-linear Optics – a sample holder for low density liquid samples or gas samples to be measured in Laser Flash Photolysis. Laser beam and probe beam intersect in the sample in an angle of 3o.
Temperature Control Options
Temperature control options are available to suit every need. These include:
A closed cycle water/coolant bath to be used with water cooled sample holders. The temperature range is -10oC to +100oC. Note that the temperature range at the sample position is somewhat reduced depending on the length and the insulation of the coolant pipes used.
A variety of TE Cooled sample holders are available covering the standard range from -10oC to +105oC or the extended range from -40oC to +150oC. Other equipment may be required to reach the extremes of the ranges. Multiple cuvettes can be simultaneous cooled with some of the options. Please contact Edinburgh Instruments for more information.
A liquid nitrogen dewar (quartz) in mounting collar with light tight seal. Sample rod, containing the sample, will be immersed into the liquid nitrogen bath thus cooling the sample to 77K.
Liquid nitrogen and liquid helium cryostats are also available with ranges 77-300K and 3.4 – 300K. They also have extended versions which extend the temperature range to 500K. The cryostats come with temperature controller, mounting flange and pedestal.
If you already have a cryostat it may be possible to integrate it with your spectrometer. Should you wish to do this, please contact the factory.
Stopped Flow Cell
This is a rapid kinetic accessory for multi-mixing capabilities. It comprises sample handling unit fitted with three 1ml (multi-mixing) drive syringes, 600mm long umbilical, manually operated drive, square mixing/observation cuvette with standard dimensions (10mm path way).
Edinburgh Instruments can also provide a range of oscilloscopes, laser power meters and laser goggles.