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  VUV Transmission and Reflection Evaluation System

VUV Transmission and Reflection Evaluation System

Description: http://img1.17img.cn/17img/images/201712/uepic/c9bc58fb-6d46-4e33-8c1e-0b7bf41a4c0a.jpg

1. Introduction

he Resonance Ltd. Transmission and Reflection Evaluation System is designed to deliver vacuum­ultraviolet (VUV) to ultraviolet (UV) radiation to a target sample and measure the reflectance, transmission or fluorescence of the target. The system includes a deuterium lamp emitting from 115 nm to 400 nm, a 200 mm focal length vacuum monochromator with a PC controlled motor drive, a Hamamatsu R8486 photomultiplier tube (PMT) capable of detecting from 115 to 320 nm, LabviewTM software and controlling electronics.

2. Features

The TR­SES­200 is a spectrophotometer that has four main system elements:

 

 

 

VUV, UV Tunable Light Source (TLS):

 

 

Hydrogen light source with power module for 100 to 240 V operation

 

 

Servo controlled VM200 Monochromator with 200 nm and 285 nm order sorter filter switch (for continuous operation from 110 to 400 nm)

 

 

Collimating Assembly

 

 

 

Servo­driven sample wheel that can tilt and rotate:

 

 

Tilt and rotate drive mechanism

 

 

Sample wheels for samples from 5 to 30 mm with clamps for non­circular samples

 

 

 

Rotating Detector:

 

 

PMT plus HV power supply and Amplifier

 

 

Rotating PMT stage with servo drive.

 

 

 

Electronics/Computing System:

Main Electronics for lamp power and servo control including an embedded PC Complete software package:

Raw spectra, Transmission, Reflectance display acquisition/storage Sample wheel and PMT control for angle scanning and sample selection Macros for batch processing.

 

 

3. System Components

Hydrogen Light Source

 

 

The system is provided with a Resonance Ltd. D2ArCM­L Hydrogen light source, supplying radiation ranging from 115 nm to 400 nm, with a photon flux of approximately 2 x 1501 photons/sec/str. The lamp is mounted using a SMA threaded adaptor and is located on the entrance slit arm of the monochromator.

 

 

 

Monochromator

 

 

Resonance VM200 scanning monochromator

 

 

The VM200 monochromator (Vacuum Monochromator 200mm focal length) contains a concave holographic grating with a VUV/UV enhanced Al/MgF2 coating. This grating has the following specifications:

 

 

No. of lines/mm12: 00 l/mm

Siz e 4:0 x 45 mm

F #4: .2

Input focal distance 2:00 mm Output focal distanc1e8: 7.9 mm Deviation angl6e4: degrees

CoatinAgl:/MgF2 optimized for 100 to 300 nm

Spectral range of best operatio1n1: 5 – 300

Total spectral Range2:5 to 1000 (gold coating recommended below 100 nm)

 

 

The grating is rotated with an absolute encoded grading drive (AEGD). It is installed in a bucket (gratings are user interchangeable) and the spectrometer has two long arms at the end of which the entrance and the exit adjustable slits are installed.

 

 

 

 

PMT Stage

 

The TR­SES­200 uses a Hamamatsu R8486 28 mm, side­on PMT. This PMT is sensitive from

115 to 320 nm with a typical quantum efficiency of 22.5% at 122 nm. It is powered using a Hamamatsu C6271 high voltage power supply socket assembly. High Voltage is controlled with the system software.

 

4. Specifications

Parameter

R8486

R8487

Unit

Spectral Response

115 to 320

115 to 195

nm

Wavelength

of Maximum Response

 

200

 

130

 

nm

Photocathode Material

Gs Te

Cs-I

 

Window Malerìal

MgF2

 

Minimum Effectirve Area

8 x 12

n π1

 

Dynode

Structure

Cìrcular-cage

-

Number  of Stage

9

 

Material

Sb-Cs

 

Direct Interelectrode Capacitances

Anode 10 Dynode No.9

Approx.4

pF

Anode10

AII Other Electrodes

 

Approx.6

 

pF

Base

11-pin base JEDEC No. 811-88

 

Weigh1

45

9

Suitable Sooke1

E678-11A (sold separately)

 

Operating Ambient Temperature

-30 to +50

C

storage Temperature

-30 to +50

C

  


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