6955
We demonstrate that surface - enhanced infrared absorption gains in the order of 10 ( 5 ) can be easily obtained in a spectral window of 3 mu m with attomolar concentrations of molecules , providing new opportunities for ultrasensitive broadband detection of molecular species via vibrational spectroscopy techniques .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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