Ultrahigh (10(-4) cm(-1)) resolution study of the 8.2-microm and 11.3-microm bands of H(2)SO(4): accurate determination of absorbance and dissociation constants.
Using a tunable diode laser spectrometer with a spectral resolution of about 10(-4) cm(-1), the important central portions of the two ir absorption bands of H(2)SO(4) at 8.2 microm (1222 cm(-1)) and 11.3 microm (880 cm(-1)) have been scanned at low pressure (0.67 Torr of H(2)SO(4)) and atmospheric pressure (H(2)SO(4) with ~1 atm N(2)). Maximum absorption coefficients have been measured to be 6.5 cm(-1)-atm(-1) and 6.9 cm(-1)-atm(-1) at the 8.2-microm and 11.3-microm bands, respectively. A novel spectroscopic method was used to determine the temperature dependence of the dissociation of H(2)SO(4) into SO(3) and H(2)O in the 127-220 degrees C range.
Eng
R S
RS
Petagna
G
G
Nill
K W
KW