Simple Fitting of Energy-Resolved Reactive Cross Sections in Threshold Collision-Induced Dissociation (T-CID) Experiments

2007 ◽  
Vol 111 (30) ◽  
pp. 7006-7013 ◽  
Author(s):  
Sanja Narancic ◽  
Andreas Bach ◽  
Peter Chen
Keyword(s):  
Cross Sections ◽  
Collision Induced Dissociation

COLLISIONS OF LONG-LIVED EXCITED IONS OF OXYGEN AND NITROGEN

1964 ◽  
Vol 42 (11) ◽  
pp. 2086-2101 ◽  
Author(s):  
William McGowan ◽  
Larkin Kerwin
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Ion Beam ◽  
Collision Induced Dissociation ◽  
Ion Molecule Reactions ◽  
Collision Region ◽  
Mean Lifetime ◽  
New States ◽  
Product Ions

The role of some excited ions in laboratory ion–molecule reactions has been investigated, and their possible importance in the upper atmosphere considered. The mass spectrometer techniques of Aston banding and of comparing I.P. curves of parent and product ions have been applied to studies of collision-induced dissociation and charge exchange of oxygen and nitrogen in their parent gas. In every case studied, cross sections depended markedly upon the presence in the ion beam of ions in metastable or long-lived radiative states. In order that an ion reach the collision region, it had to have a mean lifetime greater than 3 μsec.The a 4Πu and b 4Σg excited states of O2+ were identified in the collision[Formula: see text]Higher states of O2+, which have not as yet been identified spectroscopically, were found in the collision[Formula: see text]The thresholds of these new states are 23.9, 27.9, 31.3, and 34.1 eV with an uncertainty ±0.2 eV. From the collision-induced dissociation of N2+, the A 2Πu and the [Formula: see text] states have been identified. Also, the reported transfer of the ν = 3 level of the B [Formula: see text] to the ν = 14 level of the A 2Πu was found.The cross section for 10/01 charged exchange of N2+ in N2 exhibited a marked decrease as excited-state ions diluted the beam. The 10/01 collisions of N+ in N2 and O+ in O2 exhibited an increase in cross section as metastables were added to the parent ion beam. The 10/20 reaction of O2+ in O2 was also observed to depend on excited O2+ ions.

The charge transfer and collision-induced dissociation cross sections of state-selected H+2 and D+2 ions

1988 ◽  
Vol 119 (1) ◽  
pp. 145-158 ◽  
Author(s):  
Paul Marie Guyon ◽  
Tomas Baer ◽  
S.Keith Cole ◽  
Thomas R. Govers
Keyword(s):  
Charge Transfer ◽  
Cross Sections ◽  
Collision Induced Dissociation

The effect of a conical intersection on cross sections for collision‐induced dissociation

1988 ◽  
Vol 89 (10) ◽  
pp. 6204-6208 ◽  
Author(s):  
Normand C. Blais ◽  
Donald G. Truhlar ◽  
C. Alden Mead
Keyword(s):  
Cross Sections ◽  
Conical Intersection ◽  
Collision Induced Dissociation

Metastable Dissociation of CH5+ Ions in the Methane Mass Spectrum

1969 ◽  
Vol 24 (12) ◽  
pp. 1959-1963
Author(s):  
I Mastan ◽  
V Mercea
Keyword(s):  
Mass Spectrum ◽  
Mass Spectrometer ◽  
Cross Sections ◽  
Mass Spectrometric ◽  
Collision Induced Dissociation ◽  
Spectrometric Method ◽  
Mass Spectrometric Method ◽  
Pass Through ◽  
Straight Lines

AbstractThe main dissociation channels of the CH5+ ion, i. e. have been investigated by a mass spectrometric method. The pressure dependences of the ratios I14,90/I17 and I13,26/I17, in the range from 4,4·10-4 to 1·10-4 Torr, were plotted. The two ratios depend linearly on the pressure in the mass spectrometer analyzer. Since the two straight lines do not pass through the origine the conclusion is drawn that, for both dissociation channels of the CH5+ ion, besides the collision-induced transitions, spontaneous transitions, i. e. pure metastable transitions, take place. The spontaneous dissociations constants (λ1 = 7,5·105 sec-1 , λ2 = 5,2·104 sec-1) and collision-induced dissociation cross-sections (σ1 = 5,25 · 10-16 cm2 , σ2 = 3,2·10-16 cm2) have been estimated. These results are discussed and compared with those reported by other authors.

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