The main peculiarity of liquefied noble gases is their high inertia and transparency in the region from the far ultraviolet to the far infrared. Therefore, a cryospectroscopic technique may be employed not only for determination of basic molecular parameters (vibrational frequencies, isotopic shifts, etc.) but also for the studying of chemically aggressive and unsteady compounds, for investigation of molecular systems produced as a result of complex formation and photochemical reaction, for the determination of a small quantity of impurity in gases (approximately equals 10-4 - 10-7%), and for obtaining information concerning molecular of solute dynamics, etc.
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