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Low-energy region of rR spectra of NOCbl and its 15NO-enriched isotopomer in the base-on (top) and base-off (bottom) conformations, obtained at 77 K with 488 nm (20 491 cm–1) laser excitation. A difference spectrum for each conformation is included below the two data sets to highlight the isotope-sensitive vibrational features. Ice peaks are marked with asterisks.
