Todd Coolbaugh | Johnson C. Smith University (original) (raw)

Papers by Todd Coolbaugh

Research paper thumbnail of Novel ion-molecule reactions of C��{sup 2+} with NH�

Research paper thumbnail of Photoionization-induced intracluster reactions of chlorobenzene/ammonia mixed complexes

The Journal of Physical Chemistry, 1994

... 98. No. 31, 1994 Grover et al. ... A separate scan confined closely to the onset region, from... more ... 98. No. 31, 1994 Grover et al. ... A separate scan confined closely to the onset region, from 8.68 to 9.07 eV (Figure 4b), reveals a reasonably sharp straight-line onset at 8.935 f 0.004 eV (at the 68% confidence level, via a chi-square analysis). ...

Research paper thumbnail of Solvated ion chemistry within acetylene/acetone heterocluster ions: production of C7H10O+ and C6H7O+ cyclic ions via intracluster polymerization reactions

The Journal of Physical Chemistry, 1991

The study of chemical reactions within van der Waals clusters is a rapidly developing area of res... more The study of chemical reactions within van der Waals clusters is a rapidly developing area of research employed by a number of research gro~ ps. l-~ Although much of the effort in this area has been directed toward the elucidation of solvation effects, the reduced complexity ...

Research paper thumbnail of Intracluster polymerization reactions within acetylene and methylacetylene clusters ions

The Journal of Physical Chemistry, 1992

Page 1. J. Phys. Chem. 1992,96,9139-9144 9139 (13) Chen, I.; Ablanvitz, M.; Sharp, J. H. J. Chem.... more Page 1. J. Phys. Chem. 1992,96,9139-9144 9139 (13) Chen, I.; Ablanvitz, M.; Sharp, J. H. J. Chem. Phys. 1%9,50,2237. (14) Weil, J.; Anderson, J. J. Chem. Phys. 1961, 35, 1410. (15) Iwaaaki, M. J. Mugn. Reson. 1974, 16,417. ...

Research paper thumbnail of Argon mediated electron impact ionization of Ar sub n (CH sub 3 OH) sub m heteroclusters

J Chem Phys, 1991

ABSTRACT

Research paper thumbnail of Production of protonated methanol ions via "intermolecular" reactions within van der Waals clusters of dimethyl ether

Research paper thumbnail of Cationic polymerization within van der Waals clusters of the form (CH2:R)n+ (R = CH2, CF2, and CHCH3)

The Journal of Physical Chemistry, 1991

Research paper thumbnail of Observation of magic numbers within argon-water (ArnH2O+) heteroclusters

The Journal of Physical Chemistry, 1991

ABSTRACT We present in this communication the observation of magic numbers for the heterocluster ... more ABSTRACT We present in this communication the observation of magic numbers for the heterocluster ion Ar(n)H2O+ for n = 3, 9, and 15 which we attribute to the stability of the cluster ion. On comparison with the calculations of Bohmer and Peyerimhoff for Ar(n)Xe+, we feel this data suggests that, in the case of Ar(n)H2O+, the water cation sits at the center of the argon cluster, representing the first example of an oxygen-containing molecule exhibiting such behavior. However, while Bohmer and Peyerimhoff predict a magic number for Ar12Xe+, we do not observe one for Ar12H2O+. We postulate that this difference may be due to the water cation distorting the structure of the solvating argons.

Research paper thumbnail of Observation of magic numbers for (ROH)nH3O+ heteroclusters (R = CH3, CH3CH2, (CH3)2CH, and CH3CH2CH2): implications for cluster ion structure

J Am Chem Soc, 1992

Page 1. 3684 J. Am. Chem. SOC. 1992, 114, 3684-3689 Observation of Magic Numbers for ( ROH),H30+ ... more Page 1. 3684 J. Am. Chem. SOC. 1992, 114, 3684-3689 Observation of Magic Numbers for ( ROH),H30+ Heteroclusters (R = CH3, CH3CH2, (CH3)2CH, and CH3CH2CH2): Implications for Cluster Ion Structure William J. Herron ...

Research paper thumbnail of Electron impact ionization efficiency curves of argon clusters and argon/methanol heteroclusters

The Journal of Physical Chemistry, Feb 20, 1992

The study of van der Waals clusters is an area of growing interest and is being widely studied fo... more The study of van der Waals clusters is an area of growing interest and is being widely studied for a number of reasons. The measurement of the ionization efficiency (IE) curves have yielded a wealth of information by enabling ionization and appearance energies of ions to be determined which are essential for the calculation of thermochemical data. In the case of van der Waals clusters, the measurement of IE curves enables one to determine the qualitative trends in the ionization potentials as a function of cluster size. In addition IE curves have also offered valuable insight into ionization related processes occurring in clusters. This paper will cover some of the more recent studies of Penning ionization, exciton induced decay and Coulomb explosion in van der Waals clusters through the use of electron impact IE curves.

Research paper thumbnail of Observation of 'magic numbers' in the population distributions of the (NH3)(n-1)NH2(+) and (NH3)nH2(+) cluster ions - Implications for cluster ion structures

Research paper thumbnail of Observation of magic numbers'' in the population distributions of the (NH sub 3 ) sub n minus 1 NH sup + sub 2 and (NH sub 3 ) sub n H sup + sub 2 cluster ions: Implications for cluster ion structures

Research paper thumbnail of Mass spectrometric investigations of the structure, stability and reactivity of van der Waals clusters : clusters of ammonia, dimethyl ether and olefins /

Research paper thumbnail of Observation of Magic Numbers in the Population Distribution of the (NH3) (n-1) NH2(+) and (NH3)(n)H2(+) Cluster Ions: Implications for Cluster Ion Structure

Research paper thumbnail of Chemistry within Molecular van der Waals Clusters

Research paper thumbnail of Novel Gas Phase Ion Molecule Reactions of C60++ with O2 and NH3

We have recently utilized a tandem triple quadrupole mass spectrometer to probe the gas phase ion... more We have recently utilized a tandem triple quadrupole mass spectrometer to probe the gas phase ion-molecule chemistry of C60++ with a variety of target gases, at low collision energies. We have observed a high degree of reactivity of C60++ with oxygen to produce C60+, C6002+ and C600+. Likewise, we have also observed reactivity of C60++ with ammonia to produce C60NH2+, C60NH2(NH3)+, C60NH2(NH3)2+ and C60NH2(NH3)3+. We propose that the product ions result from an electron transfer reaction followed by covalent bond formation. All reactions were observed to be highly dependent on collision energy and target gas pressure. We believe that these processes are part of a larger family of charge exchange reactions for C60++, which occur for any molecule whose ionization potential lies below 12.25 eV, the first ionization potential of C60.

Research paper thumbnail of 2002 Tri-Service Corrosion Conference Using Vanadium to Impart Self-Healing to Conversion Coatings for Aerospace Aluminum Alloys

A new conversion coating pretreatment for aerospace aluminum alloys has been developed. Laborator... more A new conversion coating pretreatment for aerospace aluminum alloys has been developed. Laboratory testing has shown that the new coating can afford up to 336 hours of neutral salt-spray corrosion protection to AA2024-T3 and passes modified wet-tape adhesion tests. One particularly intriguing aspect of the new coating is its apparent ability to self-heal during salt-spray testing. A range of surface analytical methods was used to study the morphology and structure of the coating. It is postulated that the new coating contains vanadium rich inclusions in a zirconium hydroxide matrix. Self-healing is thought to arise from passivation of bare aluminum surfaces via leaching of vanadate, i.e. V5+, species from the coating during salt-spray testing.

Research paper thumbnail of Novel ion-molecule reactions of Cââ{sup 2+} with NHâ

Journal of The American Chemical Society, 1992

This paper reports on gas-phase associative charge transfer reactions of fullerenes with ammonia.... more This paper reports on gas-phase associative charge transfer reactions of fullerenes with ammonia. All experiments were performed with a triple-quadrupole mass spectrometer.

Research paper thumbnail of Cationic polymerization within van der Waals clusters of the form (CH2:R)n+ (R = CH2, CF2, and CHCH3)

The Journal of Physical Chemistry, 1991

Research paper thumbnail of Solvated ion chemistry within acetylene/acetone heterocluster ions: production of C7H10O+ and C6H7O+ cyclic ions via intracluster polymerization reactions

The Journal of Physical Chemistry, 1991

The study of chemical reactions within van der Waals clusters is a rapidly developing area of res... more The study of chemical reactions within van der Waals clusters is a rapidly developing area of research employed by a number of research gro~ ps. l-~ Although much of the effort in this area has been directed toward the elucidation of solvation effects, the reduced complexity ...

Research paper thumbnail of Novel ion-molecule reactions of C��{sup 2+} with NH�

Research paper thumbnail of Photoionization-induced intracluster reactions of chlorobenzene/ammonia mixed complexes

The Journal of Physical Chemistry, 1994

... 98. No. 31, 1994 Grover et al. ... A separate scan confined closely to the onset region, from... more ... 98. No. 31, 1994 Grover et al. ... A separate scan confined closely to the onset region, from 8.68 to 9.07 eV (Figure 4b), reveals a reasonably sharp straight-line onset at 8.935 f 0.004 eV (at the 68% confidence level, via a chi-square analysis). ...

Research paper thumbnail of Solvated ion chemistry within acetylene/acetone heterocluster ions: production of C7H10O+ and C6H7O+ cyclic ions via intracluster polymerization reactions

The Journal of Physical Chemistry, 1991

The study of chemical reactions within van der Waals clusters is a rapidly developing area of res... more The study of chemical reactions within van der Waals clusters is a rapidly developing area of research employed by a number of research gro~ ps. l-~ Although much of the effort in this area has been directed toward the elucidation of solvation effects, the reduced complexity ...

Research paper thumbnail of Intracluster polymerization reactions within acetylene and methylacetylene clusters ions

The Journal of Physical Chemistry, 1992

Page 1. J. Phys. Chem. 1992,96,9139-9144 9139 (13) Chen, I.; Ablanvitz, M.; Sharp, J. H. J. Chem.... more Page 1. J. Phys. Chem. 1992,96,9139-9144 9139 (13) Chen, I.; Ablanvitz, M.; Sharp, J. H. J. Chem. Phys. 1%9,50,2237. (14) Weil, J.; Anderson, J. J. Chem. Phys. 1961, 35, 1410. (15) Iwaaaki, M. J. Mugn. Reson. 1974, 16,417. ...

Research paper thumbnail of Argon mediated electron impact ionization of Ar sub n (CH sub 3 OH) sub m heteroclusters

J Chem Phys, 1991

ABSTRACT

Research paper thumbnail of Production of protonated methanol ions via "intermolecular" reactions within van der Waals clusters of dimethyl ether

Research paper thumbnail of Cationic polymerization within van der Waals clusters of the form (CH2:R)n+ (R = CH2, CF2, and CHCH3)

The Journal of Physical Chemistry, 1991

Research paper thumbnail of Observation of magic numbers within argon-water (ArnH2O+) heteroclusters

The Journal of Physical Chemistry, 1991

ABSTRACT We present in this communication the observation of magic numbers for the heterocluster ... more ABSTRACT We present in this communication the observation of magic numbers for the heterocluster ion Ar(n)H2O+ for n = 3, 9, and 15 which we attribute to the stability of the cluster ion. On comparison with the calculations of Bohmer and Peyerimhoff for Ar(n)Xe+, we feel this data suggests that, in the case of Ar(n)H2O+, the water cation sits at the center of the argon cluster, representing the first example of an oxygen-containing molecule exhibiting such behavior. However, while Bohmer and Peyerimhoff predict a magic number for Ar12Xe+, we do not observe one for Ar12H2O+. We postulate that this difference may be due to the water cation distorting the structure of the solvating argons.

Research paper thumbnail of Observation of magic numbers for (ROH)nH3O+ heteroclusters (R = CH3, CH3CH2, (CH3)2CH, and CH3CH2CH2): implications for cluster ion structure

J Am Chem Soc, 1992

Page 1. 3684 J. Am. Chem. SOC. 1992, 114, 3684-3689 Observation of Magic Numbers for ( ROH),H30+ ... more Page 1. 3684 J. Am. Chem. SOC. 1992, 114, 3684-3689 Observation of Magic Numbers for ( ROH),H30+ Heteroclusters (R = CH3, CH3CH2, (CH3)2CH, and CH3CH2CH2): Implications for Cluster Ion Structure William J. Herron ...

Research paper thumbnail of Electron impact ionization efficiency curves of argon clusters and argon/methanol heteroclusters

The Journal of Physical Chemistry, Feb 20, 1992

The study of van der Waals clusters is an area of growing interest and is being widely studied fo... more The study of van der Waals clusters is an area of growing interest and is being widely studied for a number of reasons. The measurement of the ionization efficiency (IE) curves have yielded a wealth of information by enabling ionization and appearance energies of ions to be determined which are essential for the calculation of thermochemical data. In the case of van der Waals clusters, the measurement of IE curves enables one to determine the qualitative trends in the ionization potentials as a function of cluster size. In addition IE curves have also offered valuable insight into ionization related processes occurring in clusters. This paper will cover some of the more recent studies of Penning ionization, exciton induced decay and Coulomb explosion in van der Waals clusters through the use of electron impact IE curves.

Research paper thumbnail of Observation of 'magic numbers' in the population distributions of the (NH3)(n-1)NH2(+) and (NH3)nH2(+) cluster ions - Implications for cluster ion structures

Research paper thumbnail of Observation of magic numbers'' in the population distributions of the (NH sub 3 ) sub n minus 1 NH sup + sub 2 and (NH sub 3 ) sub n H sup + sub 2 cluster ions: Implications for cluster ion structures

Research paper thumbnail of Mass spectrometric investigations of the structure, stability and reactivity of van der Waals clusters : clusters of ammonia, dimethyl ether and olefins /

Research paper thumbnail of Observation of Magic Numbers in the Population Distribution of the (NH3) (n-1) NH2(+) and (NH3)(n)H2(+) Cluster Ions: Implications for Cluster Ion Structure

Research paper thumbnail of Chemistry within Molecular van der Waals Clusters

Research paper thumbnail of Novel Gas Phase Ion Molecule Reactions of C60++ with O2 and NH3

We have recently utilized a tandem triple quadrupole mass spectrometer to probe the gas phase ion... more We have recently utilized a tandem triple quadrupole mass spectrometer to probe the gas phase ion-molecule chemistry of C60++ with a variety of target gases, at low collision energies. We have observed a high degree of reactivity of C60++ with oxygen to produce C60+, C6002+ and C600+. Likewise, we have also observed reactivity of C60++ with ammonia to produce C60NH2+, C60NH2(NH3)+, C60NH2(NH3)2+ and C60NH2(NH3)3+. We propose that the product ions result from an electron transfer reaction followed by covalent bond formation. All reactions were observed to be highly dependent on collision energy and target gas pressure. We believe that these processes are part of a larger family of charge exchange reactions for C60++, which occur for any molecule whose ionization potential lies below 12.25 eV, the first ionization potential of C60.

Research paper thumbnail of 2002 Tri-Service Corrosion Conference Using Vanadium to Impart Self-Healing to Conversion Coatings for Aerospace Aluminum Alloys

A new conversion coating pretreatment for aerospace aluminum alloys has been developed. Laborator... more A new conversion coating pretreatment for aerospace aluminum alloys has been developed. Laboratory testing has shown that the new coating can afford up to 336 hours of neutral salt-spray corrosion protection to AA2024-T3 and passes modified wet-tape adhesion tests. One particularly intriguing aspect of the new coating is its apparent ability to self-heal during salt-spray testing. A range of surface analytical methods was used to study the morphology and structure of the coating. It is postulated that the new coating contains vanadium rich inclusions in a zirconium hydroxide matrix. Self-healing is thought to arise from passivation of bare aluminum surfaces via leaching of vanadate, i.e. V5+, species from the coating during salt-spray testing.

Research paper thumbnail of Novel ion-molecule reactions of Cââ{sup 2+} with NHâ

Journal of The American Chemical Society, 1992

This paper reports on gas-phase associative charge transfer reactions of fullerenes with ammonia.... more This paper reports on gas-phase associative charge transfer reactions of fullerenes with ammonia. All experiments were performed with a triple-quadrupole mass spectrometer.

Research paper thumbnail of Cationic polymerization within van der Waals clusters of the form (CH2:R)n+ (R = CH2, CF2, and CHCH3)

The Journal of Physical Chemistry, 1991

Research paper thumbnail of Solvated ion chemistry within acetylene/acetone heterocluster ions: production of C7H10O+ and C6H7O+ cyclic ions via intracluster polymerization reactions

The Journal of Physical Chemistry, 1991

The study of chemical reactions within van der Waals clusters is a rapidly developing area of res... more The study of chemical reactions within van der Waals clusters is a rapidly developing area of research employed by a number of research gro~ ps. l-~ Although much of the effort in this area has been directed toward the elucidation of solvation effects, the reduced complexity ...