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Deposition chamber manufacturer & model number (Observation Geometry), view-port diameter, and material
Substrate material: (e.g., Silicon, GaAs, etc.)
Substrate size & thickness
Substrate temperature range of interest
How is the substrate heated? (e.g., conductive, radiative, etc.)
Are there other sources of light or heat in the vacuum chamber? (e.g., filaments, effusion cells)