High pressure Raman spectroscopy of nitric acid

Journal Article · Thu Nov 11 04:00:00 EST 1999 · Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory

DOI:https://doi.org/10.1021/jp9910486· OSTI ID:20003226

Lucas, H; Petitet, J P

New high pressure Raman spectroscopy measurements on pure anhydrous HNO{sub 3} and HNO{sub 3}-H{sub 2}O mixtures up to 38 mol% in water (commercial grade concentration) are reported up to 50 GPa. The main feature is the reversible and progressive transformation of pure solid nitric acid at pressures between 10 and 17 GPa, evidenced by an enhancement of the 1,057 cm{sup {minus}1} peak assigned to the {nu}{sub 1} vibrational stretching mode of the NO{sub 3}{sup {minus}} group and by the softening of the symmetric stretching NO{sub 2} mode with pressure. The formation of the H bonding by a charge transfer due to a strong interaction between the surrounding molecules is discussed. Two hypotheses are discussed: nitric acid might be pressure autoionized or cross-linked as a reversible polymer-like compound. These two hypotheses are not mutually exclusive. An increase of water concentration in nitric acid shifts the limit of the appearance of the NO{sub 3}{sup {minus}} vibrational mode to lower values of the pressure at constant temperature.

• Research Organization: Univ. Paris XIII, Villetaneuse (FR)
• OSTI ID: 20003226
• Journal Information: Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory, Journal Name: Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory Journal Issue: 45 Vol. 103; ISSN JPCAFH
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
54 ENVIRONMENTAL SCIENCES
ATMOSPHERIC CHEMISTRY
HIGH PRESSURE
NITRIC ACID
PROCESS SOLUTIONS
RAMAN SPECTROSCOPY
VIBRATIONAL STATES