( ( ( ( REFERENCES AND ) NOTES ) ( Even ( at ( absolute zero ) ) ) ) ( , ( there ( ( is ( ( some ( molecular motion ) ) ( due ( to ( ( a ( quantum ( mechanical effect ) ) ) ( called ( the ( zero ( point energy ) ) ) ) ) ) ) ) ) . ) ) ) )
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REFERENCES AND NOTES Even at absolute zero, there is some molecular motion due to a quantum mechanical effect called the zero point energy .
(ROOT (S (NP (NP (DT The) (NN temperature)) (SBAR (WHPP (IN at) (WHNP (WDT which))) (S (NP (DT all) (JJ molecular) (NN motion)) (VP (VBZ has) (VP (VBN ceased)))))) (VP (VBZ is) (VP (VBN called) (NP (JJ absolute) (NN zero)))) (. .)))