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evidence: The tetraoxygen molecule -LRB- O4 -RRB- , also called oxozone , was first predicted in 1924 by Gilbert N. Lewis , who proposed it as an explanation for the failure of liquid oxygen to obey Curie 's law .. Gilbert N. Lewis. Gilbert N. Lewis. liquid oxygen. liquid oxygen. Today it seems Lewis was off , but not by much  : computer simulations indicate that although there are no stable O4 molecules in liquid oxygen , O2 molecules do tend to associate in pairs with antiparallel spins , forming transient O4 units .. liquid oxygen. liquid oxygen. In 1999 , researchers thought that solid oxygen existed in its ε-phase -LRB- at pressures above 10 GPa -RRB- as O4 .. solid oxygen. solid oxygen. GPa. gigapascal. phase. phase ( matter ). However , in 2006 , it was shown by X-ray crystallography that this stable phase known as ε oxygen or red oxygen is in fact .. X-ray crystallography. X-ray crystallography. phase. phase ( matter ). Nevertheless , tetraoxygen has been detected as a short-lived chemical species in mass spectrometry experiments .. chemical species. chemical species. mass spectrometry. mass spectrometry. Absorption bands of the O4 molecule e.g. at 360 , 477 and 577 nm are frequently used to do aerosol inversions in atmospheric optical absorption spectroscopy .. absorption spectroscopy. absorption spectroscopy. Due to the known distribution of O2 and therefore also O4 , O4 slant column densities can be used to retrieve aerosol profiles which can then be used again in radiative transfer models to model light paths .