We report photoelectron imaging spectra of CuH À and CuH À 2 and their deuterated analogs. The Cu... more We report photoelectron imaging spectra of CuH À and CuH À 2 and their deuterated analogs. The CuH À photoelectron spectrum exhibits transitions to the ground (X 1 R +) and lowest excited triplet (a 3 R +) and singlet (A 1 R +) states, with EA(CuH) 0.444(6) eV. The photoelectron spectrum of linear X 1 R þ g HCuH À is dominated by a transition to the linear excited A 2 R þ g state with a 2.853 eV binding energy. It is accompanied by an extended unresolved vibrational progression involving the bent CuH 2 X 2 B 2 ground state. Ab initio calculations show a 0.255 eV energy difference between these two states allow determination of EA(CuH 2), 2.60(5) eV.
Author Institution: JILA and Department of Chemistry and Biochemistry, University of Colorado and... more Author Institution: JILA and Department of Chemistry and Biochemistry, University of Colorado and National Institute of Standards and Technology, Campus Box 440, University of Colorado, Boulder, Colorado 80309-0440
Author Institution: JILA and Department of Chemistry and Biochemistry, University of Colorado, Bo... more Author Institution: JILA and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0440, USA; Department of Chemistry, Tohoku University, Aramaki Aoba-ku, Sendai 980-8578, Japan
Journal of Oral and Maxillofacial Surgery, Apr 1, 2018
The purpose of this study was to estimate the frequency of retained ballistic fragment (RBF) remo... more The purpose of this study was to estimate the frequency of retained ballistic fragment (RBF) removal and to identify factors associated with an increased risk for RBF removal. To date, there are no studies focused on identifying factors associated with removal of RBFs localized to the maxillofacial region. Materials and Methods: Using a retrospective cohort study design, the authors enrolled a sample composed of patients with RBFs localized to the maxillofacial region. The predictor variables included bullet size, location, involvement of bone, involvement of sinus, antibiotics, multiple antibiotics, and multiple locations. The primary outcome variable was RBF retrieval. The secondary outcome variables were timing of operative retrieval, fragment site infection, and migration of RBF. Appropriate uni-and bivariate statistics were computed and logistic regression modeling was used. Results: The sample was composed of 20 patients (mean age, 30 yr; 80% male) and 55% (11 patients) required or desired object removal overall. The number of projectiles ranged from 1 to 19 (total, 48) in the 20 patients. The logistic model identified larger size, final location of bone, final location of soft tissue, and final location of sinus as having a higher probability of removal that was statistically significant (P < .05); however, size was the only variable with a substantial odds ratio (OR; 1.96; P < .05). There was no evidence of migration and a low rate (2.3%) of infection was noted at subsequent follow-up radiography and clinical examination. Conclusion: Size was the only statistically significant predictor variable with a substantial OR (1.96; 95% confidence interval, 1.31-3.40; P < .05). There was a low risk of infection even when considering oral pharyngeal contamination and low risk of migration. Further studies could focus on prudent antibiotic use and larger patient populations.
Author Institution: JILA and Department of Chemistry and Biochemistry, University of Colorado and... more Author Institution: JILA and Department of Chemistry and Biochemistry, University of Colorado and National Institute of Standards and Technology, Campus Box 440, University of Colorado, Boulder, Colorado 80309-0440
A 24 year old female presents with complaints of pain and swelling to the right mandible. A panor... more A 24 year old female presents with complaints of pain and swelling to the right mandible. A panorex radiograph was obtained that demonstrated a radiolucent trabeculated lesion extending from tooth #32 to the condylar neck. Buccal and lingual soft tissue bony expansion was evident on clinical exam. Twobiopsieswere obtained; the firstwas inconclusive and the second demonstrated a giant cell reparative granuloma. Upon composite resection of the right mandible and reconstruction with a vascularized free fibula flap, final pathology resulted in a diagnosis a low grade fibrohistiocytic sarcoma. The incidence of a sarcoma of themandible is extremely rare, with 32 confirmed cases reported in the literature. We present the misdiagnosis from a benign pathological case of a giant cell reparative granuloma to a malignant fibrohistiocytic sarcoma.
A combination of experimental methods, photoelectron-imaging spectroscopy, flowing afterglow-phot... more A combination of experimental methods, photoelectron-imaging spectroscopy, flowing afterglow-photoelectron spectroscopy and the flowing afterglow-selected ion flow tube technique, and electronic structure calculations at the B3LYP/6-311++G(d,p) level of density functional theory (DFT) have been employed to study the mechanism of the reaction of the hydroxide ion (HO-) with 1H-1,2,3-triazole. Four different product ion species have been identified experimentally, and the DFT calculations suggest that deprotonation by HOat all sites of the triazole takes place to yield these products. Deprotonation of 1H-1,2,3-triazole at the N1-H site gives the major product ion, the 1,2,3-triazolide ion. The 335 nm photoelectron-imaging spectrum of the ion has been measured. The electron affinity (EA) of the 1,2,3-triazolyl radical has been determined to be 3.447 (0.004 eV. This EA and the gas-phase acidity of 2H-1,2,3-triazole are combined in a negative ion thermochemical cycle to determine the N-H bond dissociation energy of 2H-1,2,3-triazole to be 112.2 (0.6 kcal mol-1. The 363.8 nm photoelectron spectroscopic measurements have identified the other three product ions. Deprotonation of 1H-1,2,3-triazole at the C5 position initiates fragmentation of the ring structure to yield a minor product, the ketenimine anion. Another minor product, the iminodiazomethyl anion, is generated by deprotonation of 1H-1,2,3-triazole at the C4 position, followed by N1-N2 bond fission. Formation of the other minor product, the 2H-1,2,3-triazol-4-ide ion, can be rationalized by initial deprotonation of 1H-1,2,3triazole at the N1-H site and subsequent proton exchanges within the ion-molecule complex. The EA of the 2H-1,2,3-triazol-4-yl radical is 1.865 (0.004 eV.
... I also thank Django Andrews, Jeff Rathbone, and Lenny Sheps ... for 1st Crystal in OPO Cavity... more ... I also thank Django Andrews, Jeff Rathbone, and Lenny Sheps ... for 1st Crystal in OPO Cavity.....108 Figure A.4 Diagram of the Maser Oscillator Cavity.....110 Figure A.5 Diagram for Nd:YAG rod assembly, including ...
We report photoelectron spectra of IBr$^{-}$(CO$_{2}$)$_{n}$ to understand the changes in IBr$^{-... more We report photoelectron spectra of IBr$^{-}$(CO$_{2}$)$_{n}$ to understand the changes in IBr$^{-}$ structure due to clustering. These experiments utilize anion photoelectron spectroscopy combined with velocity map imaging (VMI) to obtain photoelectron energy and angular ...
We report photoelectron imaging spectra of CuH− and CuH2- and their deuterated analogs. The CuH− ... more We report photoelectron imaging spectra of CuH− and CuH2- and their deuterated analogs. The CuH− photoelectron spectrum exhibits transitions to the ground (X1Σ+) and lowest excited triplet (a3Σ+) and singlet (A1Σ+) states, with EA(CuH) 0.444(6)eV. The photoelectron spectrum of linear X1Σg+ HCuH− is dominated by a transition to the linear excited A2Σg+ state with a 2.853eV binding energy. It is accompanied by an extended unresolved vibrational progression involving the bent CuH2X2B2 ground state. Ab initio calculations show a 0.255eV energy difference between these two states allow determination of EA(CuH2), 2.60(5)eV.
The journal of physical chemistry. B, Jan 17, 2008
A combination of experimental methods, photoelectron-imaging spectroscopy, flowing afterglow-phot... more A combination of experimental methods, photoelectron-imaging spectroscopy, flowing afterglow-photoelectron spectroscopy and the flowing afterglow-selected ion flow tube technique, and electronic structure calculations at the B3LYP/6-311++G(d,p) level of density functional theory (DFT) have been employed to study the mechanism of the reaction of the hydroxide ion (HO-) with 1H-1,2,3-triazole. Four different product ion species have been identified experimentally, and the DFT calculations suggest that deprotonation by HO- at all sites of the triazole takes place to yield these products. Deprotonation of 1H-1,2,3-triazole at the N1-H site gives the major product ion, the 1,2,3-triazolide ion. The 335 nm photoelectron-imaging spectrum of the ion has been measured. The electron affinity (EA) of the 1,2,3-triazolyl radical has been determined to be 3.447 +/- 0.004 eV. This EA and the gas-phase acidity of 2H-1,2,3-triazole are combined in a negative ion thermochemical cycle to determine th...
We report photoelectron imaging spectra of CuH À and CuH À 2 and their deuterated analogs. The Cu... more We report photoelectron imaging spectra of CuH À and CuH À 2 and their deuterated analogs. The CuH À photoelectron spectrum exhibits transitions to the ground (X 1 R +) and lowest excited triplet (a 3 R +) and singlet (A 1 R +) states, with EA(CuH) 0.444(6) eV. The photoelectron spectrum of linear X 1 R þ g HCuH À is dominated by a transition to the linear excited A 2 R þ g state with a 2.853 eV binding energy. It is accompanied by an extended unresolved vibrational progression involving the bent CuH 2 X 2 B 2 ground state. Ab initio calculations show a 0.255 eV energy difference between these two states allow determination of EA(CuH 2), 2.60(5) eV.
Author Institution: JILA and Department of Chemistry and Biochemistry, University of Colorado and... more Author Institution: JILA and Department of Chemistry and Biochemistry, University of Colorado and National Institute of Standards and Technology, Campus Box 440, University of Colorado, Boulder, Colorado 80309-0440
Author Institution: JILA and Department of Chemistry and Biochemistry, University of Colorado, Bo... more Author Institution: JILA and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0440, USA; Department of Chemistry, Tohoku University, Aramaki Aoba-ku, Sendai 980-8578, Japan
Journal of Oral and Maxillofacial Surgery, Apr 1, 2018
The purpose of this study was to estimate the frequency of retained ballistic fragment (RBF) remo... more The purpose of this study was to estimate the frequency of retained ballistic fragment (RBF) removal and to identify factors associated with an increased risk for RBF removal. To date, there are no studies focused on identifying factors associated with removal of RBFs localized to the maxillofacial region. Materials and Methods: Using a retrospective cohort study design, the authors enrolled a sample composed of patients with RBFs localized to the maxillofacial region. The predictor variables included bullet size, location, involvement of bone, involvement of sinus, antibiotics, multiple antibiotics, and multiple locations. The primary outcome variable was RBF retrieval. The secondary outcome variables were timing of operative retrieval, fragment site infection, and migration of RBF. Appropriate uni-and bivariate statistics were computed and logistic regression modeling was used. Results: The sample was composed of 20 patients (mean age, 30 yr; 80% male) and 55% (11 patients) required or desired object removal overall. The number of projectiles ranged from 1 to 19 (total, 48) in the 20 patients. The logistic model identified larger size, final location of bone, final location of soft tissue, and final location of sinus as having a higher probability of removal that was statistically significant (P < .05); however, size was the only variable with a substantial odds ratio (OR; 1.96; P < .05). There was no evidence of migration and a low rate (2.3%) of infection was noted at subsequent follow-up radiography and clinical examination. Conclusion: Size was the only statistically significant predictor variable with a substantial OR (1.96; 95% confidence interval, 1.31-3.40; P < .05). There was a low risk of infection even when considering oral pharyngeal contamination and low risk of migration. Further studies could focus on prudent antibiotic use and larger patient populations.
Author Institution: JILA and Department of Chemistry and Biochemistry, University of Colorado and... more Author Institution: JILA and Department of Chemistry and Biochemistry, University of Colorado and National Institute of Standards and Technology, Campus Box 440, University of Colorado, Boulder, Colorado 80309-0440
A 24 year old female presents with complaints of pain and swelling to the right mandible. A panor... more A 24 year old female presents with complaints of pain and swelling to the right mandible. A panorex radiograph was obtained that demonstrated a radiolucent trabeculated lesion extending from tooth #32 to the condylar neck. Buccal and lingual soft tissue bony expansion was evident on clinical exam. Twobiopsieswere obtained; the firstwas inconclusive and the second demonstrated a giant cell reparative granuloma. Upon composite resection of the right mandible and reconstruction with a vascularized free fibula flap, final pathology resulted in a diagnosis a low grade fibrohistiocytic sarcoma. The incidence of a sarcoma of themandible is extremely rare, with 32 confirmed cases reported in the literature. We present the misdiagnosis from a benign pathological case of a giant cell reparative granuloma to a malignant fibrohistiocytic sarcoma.
A combination of experimental methods, photoelectron-imaging spectroscopy, flowing afterglow-phot... more A combination of experimental methods, photoelectron-imaging spectroscopy, flowing afterglow-photoelectron spectroscopy and the flowing afterglow-selected ion flow tube technique, and electronic structure calculations at the B3LYP/6-311++G(d,p) level of density functional theory (DFT) have been employed to study the mechanism of the reaction of the hydroxide ion (HO-) with 1H-1,2,3-triazole. Four different product ion species have been identified experimentally, and the DFT calculations suggest that deprotonation by HOat all sites of the triazole takes place to yield these products. Deprotonation of 1H-1,2,3-triazole at the N1-H site gives the major product ion, the 1,2,3-triazolide ion. The 335 nm photoelectron-imaging spectrum of the ion has been measured. The electron affinity (EA) of the 1,2,3-triazolyl radical has been determined to be 3.447 (0.004 eV. This EA and the gas-phase acidity of 2H-1,2,3-triazole are combined in a negative ion thermochemical cycle to determine the N-H bond dissociation energy of 2H-1,2,3-triazole to be 112.2 (0.6 kcal mol-1. The 363.8 nm photoelectron spectroscopic measurements have identified the other three product ions. Deprotonation of 1H-1,2,3-triazole at the C5 position initiates fragmentation of the ring structure to yield a minor product, the ketenimine anion. Another minor product, the iminodiazomethyl anion, is generated by deprotonation of 1H-1,2,3-triazole at the C4 position, followed by N1-N2 bond fission. Formation of the other minor product, the 2H-1,2,3-triazol-4-ide ion, can be rationalized by initial deprotonation of 1H-1,2,3triazole at the N1-H site and subsequent proton exchanges within the ion-molecule complex. The EA of the 2H-1,2,3-triazol-4-yl radical is 1.865 (0.004 eV.
... I also thank Django Andrews, Jeff Rathbone, and Lenny Sheps ... for 1st Crystal in OPO Cavity... more ... I also thank Django Andrews, Jeff Rathbone, and Lenny Sheps ... for 1st Crystal in OPO Cavity.....108 Figure A.4 Diagram of the Maser Oscillator Cavity.....110 Figure A.5 Diagram for Nd:YAG rod assembly, including ...
We report photoelectron spectra of IBr$^{-}$(CO$_{2}$)$_{n}$ to understand the changes in IBr$^{-... more We report photoelectron spectra of IBr$^{-}$(CO$_{2}$)$_{n}$ to understand the changes in IBr$^{-}$ structure due to clustering. These experiments utilize anion photoelectron spectroscopy combined with velocity map imaging (VMI) to obtain photoelectron energy and angular ...
We report photoelectron imaging spectra of CuH− and CuH2- and their deuterated analogs. The CuH− ... more We report photoelectron imaging spectra of CuH− and CuH2- and their deuterated analogs. The CuH− photoelectron spectrum exhibits transitions to the ground (X1Σ+) and lowest excited triplet (a3Σ+) and singlet (A1Σ+) states, with EA(CuH) 0.444(6)eV. The photoelectron spectrum of linear X1Σg+ HCuH− is dominated by a transition to the linear excited A2Σg+ state with a 2.853eV binding energy. It is accompanied by an extended unresolved vibrational progression involving the bent CuH2X2B2 ground state. Ab initio calculations show a 0.255eV energy difference between these two states allow determination of EA(CuH2), 2.60(5)eV.
The journal of physical chemistry. B, Jan 17, 2008
A combination of experimental methods, photoelectron-imaging spectroscopy, flowing afterglow-phot... more A combination of experimental methods, photoelectron-imaging spectroscopy, flowing afterglow-photoelectron spectroscopy and the flowing afterglow-selected ion flow tube technique, and electronic structure calculations at the B3LYP/6-311++G(d,p) level of density functional theory (DFT) have been employed to study the mechanism of the reaction of the hydroxide ion (HO-) with 1H-1,2,3-triazole. Four different product ion species have been identified experimentally, and the DFT calculations suggest that deprotonation by HO- at all sites of the triazole takes place to yield these products. Deprotonation of 1H-1,2,3-triazole at the N1-H site gives the major product ion, the 1,2,3-triazolide ion. The 335 nm photoelectron-imaging spectrum of the ion has been measured. The electron affinity (EA) of the 1,2,3-triazolyl radical has been determined to be 3.447 +/- 0.004 eV. This EA and the gas-phase acidity of 2H-1,2,3-triazole are combined in a negative ion thermochemical cycle to determine th...
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