7892
The instrument utilizes incoherent broad - band cavity - enhanced absorption spectroscopy ( IBBCEAS ) and incorporates an optomechanical shutter to modulate light from a continuous incoherent light source , enabling measurements of durations as low as ~ 400 mu s .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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