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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > set of lines > set of molecular lines > band head

band head comparison table

Subject	is a kind of	has definition
set of molecular lines	set of lines
band head	set of molecular lines	The conspicuous sharp boundary which usually occurs at the head of a molecular band and which fades gradually toward either longer or shorter wavelengths, depending on the quadratic relation between frequency and rotational quantum number.

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