( ( ( The grooves ) ( on ( a CD ) ) ) ( ( produce ( ( ( an ( effective ( ` ( diffraction ( grating ' ) ) ) ) ) , ) ( so ( reflected ( light ( produces ( ( ( a ( rainbow luminescence ) ) ( rather than ) ) ( a ( ( plain white ) light ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN grooves)) (PP (IN on) (NP (DT a) (NN CD)))) (VP (VBP produce) (NP (NP (DT an) (JJ effective) (`` `) (NN diffraction) (NN grating) ('' ')) (, ,) (SBAR (IN so) (S (VP (VBD reflected) (SBAR (S (NP (NN light)) (VP (VBZ produces) (NP (NP (DT a) (NN rainbow) (NN luminescence)) (CONJP (RB rather) (IN than)) (NP (DT a) (ADJP (RB plain) (JJ white)) (NN light))))))))))) (. .)))
The grooves on a CD produce an effective 'diffraction grating', so reflected light produces a rainbow luminescence rather than a plain white light.
(ROOT (S (NP (NP (NNP Producing) (NN light)) (PP (IN without) (NP (DT a) (JJ high) (NN temperature)))) (VP (VBZ is) (VP (VBN called) (S (ADJP (JJ luminescence))))) (. .)))