( ( This technique ) ( ( ( measures ( ( the absorption ) ( of ( various ( infrared ( light wavelengths ) ) ) ) ) ) ( by ( ( the material ) ( of interest ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN technique)) (VP (VBZ measures) (NP (NP (DT the) (NN absorption)) (PP (IN of) (NP (JJ various) (JJ infrared) (NN light) (NNS wavelengths)))) (PP (IN by) (NP (NP (DT the) (NN material)) (PP (IN of) (NP (NN interest)))))) (. .)))
This technique measures the absorption of various infrared light wavelengths by the material of interest.
(ROOT (S (NP (NP (NNP Light)) (PP (IN with) (NP (DT the) (JJS longest) (NNS wavelengths)))) (VP (VBZ is) (VP (VBN called) (NP (JJ infrared) (NN light)))) (. .)))