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

set of molecular lines
subject			fact

set of molecular lines	is a kind of set of lines
	has species molecule
spectral feature	has wavelength
	has width
	occurs in
radiation measurement	has unit radiation unit
number	has value

Kinds of set of molecular lines :

• band head (2 facts) - 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.
• molecular band (15 kinds, 55 facts) - A series of closely spaced, often unresolved, emission or absorption lines found in the spectra of molecules. Each line represents an increment of energy due to a change in the rotational state of the molecule.
• P-branch (2 facts) - A set of lines in the spectra of molecules corresponding to unit increases in rotational energy.
• Q-branch (2 facts) - A set of lines in the spectra of molecules corresponding to changes in vibrational energy with none in rotational energy.
• R-branch (2 facts) - A set of lines in the spectra of molecules corresponding to unit decreases in rotational energy.