Kore Systems: Other Surface Techniques
Laser ablation TOF-MS.

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Mini-TOF-MS with Cassegrain Optics

This instrument was designed for studying the interaction of a femto-second laser with a sample surface in vacuo, onto which various gases are adsorbed. The interaction of the laser and the sample surface generates ions, and the TOF-MS measures the mass of the liberated ions. The laser operates quasi-continuously at 80MHz, and therefore generates ions quasi-continuously also. The extraction lens is pulsed and samples from this stream at up to ~50kHz, using a pulse counting detection scheme, so that each TOF cycle contains data produced during many laser pulses.

 

This instrument uses the same mass spectrometer ‘engine’ as our other Mini- TOF-MS, but differs considerably in its front-end configuration, because of the very different application.

Features
The Cassegrain

Kore manufactures a Cassegrain optics that is unique because it has a high numerical aperture, an all-metal construction, is ultra high vacuum compatible, and is designed for extraction of ions from near the optical focus.

 

The Cassegrain geometry allows a relatively long working distance without unduly limiting the numerical aperture and hence diffraction-limited spot size. As a result it has been possible to fit a three-plate electrostatic ion lens assembly between the optical lens and the sample surface. This collects ions created at the optical focus, focussing and directing them through apertures on the axis of the optical elements so they emerge from the rear of the Cassegrain assembly.

 

Laser light to be focused is directed through the side of the Cassegrain assembly, being reflected onto the optical axis by an integral 45 degree mirror. Thus both light optics and ion optics can share a common axis, normal to the sample surface, with simultaneous high performance.

 

We now offer the extraction lens, Cassegrain optics, flight tube, reflectron, ion detector and pre-amplifier as a separate add-on TOF-MS, complete with cable set and a single, 19 inch rack power supply.

 

The mounting flange in the system shown is a 114 OD CF, and the extraction lens system is re-entrant into the client chamber to a length of 112mm (can be varied upon request). The lens-to-sample distance is 5mm.

 

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PRICING AND ORDERING

Kore Technology is a centre of excellence in time-of-flight mass spectrometer technology and has a very strong R&D capability in terms of its personnel, all of whom have been heavily involved in a variety of analytical instrumentation development programmes.

 

If you have any questions please feel free to contact us via our online form or telephone us for more information, we offer a wide range of products and services to suit your requirements.

 

If you wish to purchase our products, please contact Kore sales at sales@kore.co.uk, or call +44 (0)1353 653030.

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