A Fourier Transform Infrared Study of the Rate Constant of the Homogeneous Gas-Phase Reaction N2 O5+ H2 O and Determination of Absolute Infrared Band Intensities of N2 O5 and HNO3

N2O5 WAS REACTED WITH WATER VAPOUR IN LARGE FEP-TEFLON BAGS AND ITS DECAY FOLLOWED BY SAMPLING IN A WHITE GAS CELL USING INFRARED FOURIER TRANSFORM SPECTROSCOPY. A RATE CONSTANT FOR THE HOMOGENEOUS N2O5+H2O GAS PHASE REACTION AT 296 PLUS/MINUS 2K AND 740 TORR TOTAL PRESSURE, EQUAL TO 1.48 PLUS/MINUS 0.42X10-21 CM+3 MOLEC-1 S-1 WAS OBSERVED. CRITICAL ANALYSIS OF THE RESULTS SUGGEST THAT THE TRUE HOMOGENOUS RATE CONSTANT MIGHT BE LOWER. THE MEASURED ABSOLUTE INTENSITIES OF THE N2O5 710-780 CM-1 AND 1225-1270 CM-1 BANDS WERE 4.57X10-17 AND 3.81X10-17 CM+1 MOLEC-1, RESPECTIVELY. THE MEASURED HNO3 ABSOLUTE INTENSITIES OF THE OVERLAPPING BAND SYSTEMS V5, 2V9 AND V5+V9-V9 (840-930 CM-1) AND V3, V4 (1270-1350 CM-1) WERE 2.21X10-17 AND 4.29X10-17 CM+1 MOLEC-1, RESPECTIVELY.

RESTELLI Giambattista;  CAPPELLANI Francesco;  OTTOBRINI Giuseppe; 

1995-03-15

JRC4771

https://publications.jrc.ec.europa.eu/repository/handle/JRC4771,