56583-62-1

Basic information

• Product Name: oxidanium
• Synonyms: oxidanium;Oxoniumyl;Water ion
• CAS NO: 56583-62-1
• Molecular Formula: H₂O
• Molecular Weight: 18.01528
• Mol File: 56583-62-1.mol
• Article Data: 10

Chemical Properties

• Boiling Point: °Cat760mmHg
• Flash Point: °C
• Appearance: /
• Density: g/cm³
• CAS DataBase Reference: oxidanium(CAS DataBase Reference)
• NIST Chemistry Reference: oxidanium(56583-62-1)
• EPA Substance Registry System: oxidanium(56583-62-1)

Safety Data

• Hazardous Substances Data: 56583-62-1(Hazardous Substances Data)

Upstream product

• 7732-18-5 water 
• 201230-82-2 carbon monoxide 
• 1333-74-0 hydrogen 
• 17596-58-6 Ar₂⁽¹⁺⁾ 
• 7789-20-0 water-d2 
• 28132-48-1 triatomic hydrogen ion 
• 80937-33-3 oxygen 

Downstream Products

• 14701-12-3 sulphonium 
• 7704-34-9 mercapto radical 
• 3352-57-6 hydroxyl 
• 1033995-63-9 oxonium 

Relevant articles and documents

H3++O: An experimental study

We have measured the reaction rate coefficient and branching ratios for the H3++O atom reaction using a flowing afterglow/selected ion flow tube operating at room temperature (295±5 K). The measured rate coefficient was k=(1.2±0.5)×10-9 cm3 s-1 and the branching ratios were OH++H2, (70%) and H2O++H (30%). This reaction has some relevance to the synthesis of water in interstellar clouds.

Observation of the visible absorption spectrum of H2O+

The A2A1-X2B1 system of H2O+ has been observed, using laser absorption spectroscopy in a velocity-modulated discharge.A total of 78 transitions between 14 794 and 15 475 cm-1 have been observed with an uncertainty (1 SD) of 0.02 cm-1, including 76 transitions in the (0,7,0)-(0,0,0) band and 2 in the (0,8,0)-(0,0,0) band.This species is important for cometary astronomy, and intriguing for molecular physics because of its prominent Renner-Teller interaction.Careful measurements were made of the relative intensities of the absorption lines, which were measured to an accuracy of 13percent (1 SD).This is the first observation of the >A-X transition in absorption; all previous data were obtained in emission with conventional grating spectroscopy.The transition frequencies of our new data are in good agreement with previous work, and have improved accuracy.The new data have definite rejection of the interfering lines from excited neutral H2 that plagues previous work.Compared with previous work, the new data have the first quantitative measurement of intensities.The ratio of the Franck-Condon factors I8/I7 = 0.99 +/- 0.43 has been measured for the first time, where Iv = FCF.

The yield of oxygen and hydrogen atoms through dissociative recombination of H2O+ ions with electrons

The branching ratios of the dissociative recombination of excited H2O+ ions with electrons were studied using a plasma flow tube experiment.The total oxygen atom channel accounts for 45percent of the recombination with more than 24percent in O + H + H .The remaining channel is OH + H for 55percent.These results are discussed in comparison with the few available theories and with photodissociation data.