The reaction of F atoms with O2 in an argon matrix

The infrared spectroscopy and photochemistry of NO3 trapped in solid neon

“…Although O 2 is infrared inactive, its infrared absorption has been seen in a variety of other systems. For example, an absorption at 1548 cm −1 which appeared when F atoms reacted with O 2 in an argon matrix was attributed 50 to O 2 perturbed either by a second O 2 molecule or by F 2 trapped in a nearby site.…”

Mercury Is a Transition Metal: The First Experimental Evidence for HgF4

“…[7] These bands appear upon UV irradiation of the HgF 2 molecule, and their intensity increases slightly on annealing under conditions where F atoms diffuse through the solid lattice, [15][16][17]21] when OOF radical is also produced from the combination of F atoms and O 2 impurity in fluorine. Hence, the weak bands appear under reaction conditions for which HgF 4 has been predicted to form, [6][7][8] namely the exothermic reaction of HgF 2 with F 2 , and in particular reaction with two fluorine atoms (see above).…”

“…Neon is less polarizable and can be repulsive (sometimes with a blue matrix shift), whereas argon supports a more attractive interaction. [24] Two relevant cases are OOF, with bands at 1508 cm À1 in a neon matrix (this work), 1489.6 cm À1 in an argon matrix (this work and reference [21]), and 1486.9 cm À1 in the gas phase, [25] and MgF 2 with absorptions at 862 cm À1 in a neon matrix and 840 cm À1 in an argon matrix [26] and with an estimated gasphase frequency of 825 AE 20 cm À1 . [27] Clearly HgF 2 sets an example, with bands at 658 cm À1 in a neon matrix and 645 cm À1 in an argon matrix, and our new bands for HgF 4 at 703 and 682 cm À1 , respectively, follow suit.…”

“…[20] Additional weak bands were observed at 703, 637, and 613 cm À1 , and a higher-frequency band was detected at 1508 cm À1 , where OOF should absorb in solid neon, considering its strong band at 1490 cm À1 in solid argon. [21] Further irradiation with the full light of the mercury arc increased the intensity of these bands (Figure 1 c). Annealing the sample to 8 K to allow further reagent aggregation increased the intensity of the 703 cm À1 band at the expense of the 657.5 cm À1 band (Figure 1 d).…”

Spectroscopy and photochemistry of free radicals formed by the reaction of F atoms with small molecules

“…Later electronic spectral observations in the laboratory of Tupikov supported the assignment of an absorption with maximum near 445 nm to a dissociative transition of FO 2 in liquid argon [42] and of a gas-phase absorption near 205 nm [43] to a second transition of this species. In recent matrix isolation studies using discharge sampling, Jacox [44] has circumvented the problem of the photodissociation of FO 2 that had complicated earlier studies and has stabilized a sufficient concentration of FO 2 in an argon matrix for detection not only of the two vibrational fundamentals above the 400 cm -I low frequency cutoff of the spectrophotometer but also of the first overtones of the two stretching fundamentals and of a combination band. Photodissociation, with growth in the absorptions of 02F 2, could be induced by exposure of the sample to radiation of wavelength shorter than 490 nm.…”