Reflectance Standards And Gain Settings - Agilent Technologies 4200 FlexScan Operation Manual

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User manual (54 pages)

Table Of Contents

Table of Contents

Analyzing

Samples

The 45 degree probe is optimal for analysis of thin films greater than

1 micron in thickness. The grazing angle probe is optimal for analysis

of ultra thin films less than 1 micron in thickness. Diffuse reflectance

is specifically designed for measurement of rough surfaces that

scatter rather than reflect light. Specular reflectance is an ideal

method for the analysis of surface contamination. The grazing angle

probe should be used when very low level contamination needs to be

analyzed (nanometer thickness levels).

Each reflectance sample interface requires the use of a reference

sample for taking the background measurement prior to analyzing

the sample. The reference sample is incorporated into the 4200

FlexScan FTIR by means of a metal disk mounted into a cap that

snaps onto the tip of the reflectance probe. The 4200 FlexScan

system offers two reference caps designed for this purpose — a

diffuse gold reference cap with a rough surface finish and a stainless

steel mirror reference cap with a very smooth surface finish.

The diffuse gold reference cap should be used with the 45 degree

reflectance probe when measuring low-reflectance samples. The

mirror reference cap should be used with the 45 degree reflectance

probe when measuring thin films or highly-reflecting samples. The

mirror reference cap should always be used with the grazing angle

sample probe. The diffuse cap should always be used with the diffuse

reflectance sample interface.

Ensure that the sample makes solid contact with the entire surface area of the

CAUTION

external reflectance probe tip and is not held at an angle against the sample, and

that no movement occurs between the sample and the probe during the

measurement.