1
|
|
2
|
Derzy I, Lozovsky VA, Cheskis S. CH, NH, and NH2Concentration Profiles in Methane/Air Flames Doped with N2O. Isr J Chem 2013. [DOI: 10.1002/ijch.199900005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
3
|
Campbell WC, Tsikata E, Lu HI, van Buuren LD, Doyle JM. Magnetic trapping and Zeeman relaxation of NH (X3Sigma-). PHYSICAL REVIEW LETTERS 2007; 98:213001. [PMID: 17677770 DOI: 10.1103/physrevlett.98.213001] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2007] [Indexed: 05/15/2023]
Abstract
NH radicals are magnetically trapped and their Zeeman relaxation and energy transport collision cross sections with helium are measured. Continuous buffer-gas loading of the trap is direct from a room-temperature molecular beam. The Zeeman relaxation (inelastic) cross section of magnetically trapped electronic, vibrational, and rotational ground state NH molecules in collisions with 3He is measured to be 3.8+/-1.1 x 10(-19) cm(2) at 710 mK. The NH-He energy transport cross section is also measured, indicating a ratio of diffusive to inelastic cross sections of gamma=7 x 10(4), in agreement with recent theory [R. V. Krems, H. R. Sadeghpour, A. Dalgarno, D. Zgid, J. Kłos, and G. Chałasiński, Phys. Rev. A 68, 051401 (2003)10.1103/PhysRevA.68.051401].
Collapse
Affiliation(s)
- Wesley C Campbell
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
| | | | | | | | | |
Collapse
|
4
|
Davidson DF, Kohse-Höinghaus K, Chang AY, Hanson RK. A pyrolysis mechanism for ammonia. INT J CHEM KINET 2004. [DOI: 10.1002/kin.550220508] [Citation(s) in RCA: 149] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
5
|
Kind M, Meden P, Stuhl F. Fate of isolated CH(B2Σ−,v=0,J) states in inelastic collisions with CO. J Chem Phys 2002. [DOI: 10.1063/1.1522714] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
6
|
Hake A, Stuhl F. State-resolved radiative lifetimes of the NH(A 3Π,v=0) radical and rate constants for the quenching by NH3. J Chem Phys 2002. [DOI: 10.1063/1.1493195] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
|
7
|
Tobai J, Dreier T, Daily JW. Rotational level dependence of ground state recovery rates for OH X 2Π(v″=0) in atmospheric pressure flames using the picosecond saturating-pump degenerate four-wave mixing probe technique. J Chem Phys 2002. [DOI: 10.1063/1.1448284] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
8
|
Brunet SMK, Guo J, Carrington T, Filseth SV, Sadowski CM. State-to-state and total rotational energy transfer rate constants for CN(B 2Σ+,v=0,N)+H2, CN(X 2Σ+,v=2,N)+H2, D2, and CN(X 2Σ+,v=3,N)+NO. J Chem Phys 2002. [DOI: 10.1063/1.1446033] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
9
|
Meden P, Kind M, Stuhl F. Rotationally resolved quenching and relaxation of CH(A2Δ,v=0,N) in the presence of CO. J Chem Phys 2002. [DOI: 10.1063/1.1436110] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
|
10
|
Hemming BL, Crosley DR, Harrington JE, Sick V. Collisional quenching of high rotational levels in A 2Σ+ OH. J Chem Phys 2001. [DOI: 10.1063/1.1386783] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
11
|
Tobai J, Dreier T. Measurement of relaxation times of NH in atmospheric pressure flames using picosecond pump-probe degenerate four-wave mixing. J Mol Struct 1999. [DOI: 10.1016/s0022-2860(98)00703-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
12
|
Buckley SG, Damm CJ, Vitovec WM, Sgro LA, Sawyer RF, Koshland CP, Lucas D. Ammonia detection and monitoring with photofragmentation fluorescence. APPLIED OPTICS 1998; 37:8382-8391. [PMID: 18301663 DOI: 10.1364/ao.37.008382] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Excimer laser fragmentation-fluorescence spectroscopy is an effective detection strategy for NH(3) in combustion exhausts at atmospheric pressure and high temperatures. Two-photon photofragmentation of NH(3) with 193-nm light yields emission from the NH(A-X) band at 336 nm. There are no major interferences in this spectral region, and the sensitivity is at the parts per billion (ppb) level. Quenching of the NH(A) state radical by the major combustion products is measured and does not limit the applicability of the detection method. Detection limits in practical situations are of the order of 100 ppb for a 100-shot (1-s) average. This technique could prove useful in monitoring ammonia emissions from catalytic and noncatalytic NO(x) reduction processes involving ammonia injection.
Collapse
|
13
|
Hohmann J, Stuhl F. Kinetic Study of Inelastic Collisions of NH/ND(cΠ,v,J) with O2: Rotational and Vibrational Relaxation, Quenching, and Intersystem Crossing. J Phys Chem A 1997. [DOI: 10.1021/jp970647e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. Hohmann
- Physikalische Chemie I, Ruhr-Universität Bochum, D-44780 Bochum, Germany
| | - F. Stuhl
- Physikalische Chemie I, Ruhr-Universität Bochum, D-44780 Bochum, Germany
| |
Collapse
|
14
|
Umemoto H, Asai T, Kimura Y. Nascent rotational and vibrational state distributions of NH(X 3Σ−) and ND(X 3Σ−) produced in the reactions of N(2 2D) with H2 and D2. J Chem Phys 1997. [DOI: 10.1063/1.473546] [Citation(s) in RCA: 89] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
|
15
|
Umemoto H, Matsumoto K. Production of NH(ND) radicals in the reactions of N(22D) with H2(D2): Nascent vibrational distributions of NH(X 3Σ−) and ND(X 3Σ−). J Chem Phys 1996. [DOI: 10.1063/1.471716] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
16
|
Gas temperature above a porous radiant burner: Comparison of measurements and model predictions. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/s0082-0784(96)80401-2] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
17
|
|
18
|
|
19
|
Couris S, Anastasopoulou N, Fotakis C. Rotational dependence of the quenching of electronically excited CH(A 2Δ) and CH (B 2Σ−) produced by laser photolysis of acetone at 193 nm. Chem Phys Lett 1994. [DOI: 10.1016/0009-2614(94)00472-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
20
|
Rate constants for removal by noble gases of selected rotational levels of methylene 1B1 (0, 14, 0). Chem Phys Lett 1993. [DOI: 10.1016/0009-2614(93)90086-g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
21
|
Drake MC, Ratcliffe JW. High temperature quenching cross sections for nitric oxide laser‐induced fluorescence measurements. J Chem Phys 1993. [DOI: 10.1063/1.465047] [Citation(s) in RCA: 85] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
22
|
Drake MC, Ratcliffe JW. High temperature quenching cross sections for nitric oxide laser‐induced fluorescence measurements. J Chem Phys 1993. [DOI: 10.1063/1.465047%0a%0a%0a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
23
|
Kaes A, Stuhl F. Quenching, Λ‐doublet mixing and fluorescence lifetimes of single excited NH(A 3Π,v’=0,N’,J’,e/f ) states. J Chem Phys 1992. [DOI: 10.1063/1.463507] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
24
|
|
25
|
Chappell EL, Jeffries JB, Crosley DR. Collisional quenching of highly rotationally excited NH (A 3Πi). J Chem Phys 1992. [DOI: 10.1063/1.463079] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
26
|
Mertens JD, Chang AY, Hanson RK, Bowman CT. A shock tube study of reactions of atomic oxygen with isocyanic acid. INT J CHEM KINET 1992. [DOI: 10.1002/kin.550240306] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
27
|
Salzberg A, Santiago DI, Asmar F, Sandoval DN, Weiner BR. Collision-induced electronic quenching of aluminum monoxide. Chem Phys Lett 1991. [DOI: 10.1016/0009-2614(91)87134-w] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
28
|
Parlant G, Dagdigian PJ, Yarkony DR. Predissociation of the c 1Π state of NH (ND): The role of dipolar spin–spin coupling. J Chem Phys 1991. [DOI: 10.1063/1.459907] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
29
|
Patel‐Misra D, Parlant G, Sauder DG, Yarkony DR, Dagdigian PJ. Radiative and nonradiative decay of the NH(ND)A 3Π electronic state: Predissociation induced by the5Σ−state. J Chem Phys 1991. [DOI: 10.1063/1.459912] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
30
|
Mertens JD, Chang AY, Hanson RK, Bowman CT. A shock tube study of the reactions of NH with NO, O2, and O. INT J CHEM KINET 1991. [DOI: 10.1002/kin.550230208] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
31
|
Kirby KP, Goldfield EM. Theoretical study of the radiative properties of the triplet states of the NH radical: Transition dipole moments, radiative lifetimes, photodissociation cross sections. J Chem Phys 1991. [DOI: 10.1063/1.460036] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
32
|
Vegiri A, Farantos SC. Ab initio potential energy surfaces for studying the quenching of CH(A 2Δ) by H2(X 1Σg+). Chem Phys Lett 1990. [DOI: 10.1016/0009-2614(90)87168-q] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
33
|
Yarkony DR. On the electronic structure of the NH radical. The fine structure splitting of the X 3Σ− state and the spin‐forbidden (b 1Σ+, a 1Δ)→X 3Σ−, and the spin‐allowed A 3Π→X 3Σ− and c 1Π→(b 1Σ+, a 1Δ), radiative transitions. J Chem Phys 1989. [DOI: 10.1063/1.457622] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
34
|
Rensberger KJ, Jeffries JB, Copeland RA, Kohse-Höinghaus K, Wise ML, Crosley DR. Laser-induced fluorescence determination of temperatures in low pressure flames. APPLIED OPTICS 1989; 28:3556-3566. [PMID: 20555739 DOI: 10.1364/ao.28.003556] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Spatially resolved temperatures in a variety of low pressure flames of hydrogen and hydrocarbons burning with oxygen and nitrous oxide are determined from OH, NH, CH, and CN laser-induced fluorescence rotational excitation spectra. Systematic errors arising from spectral bias, time delay, and temporal sampling gate of the fluorescence detector are considered. In addition, we evaluate the errors arising from the influences of the optical depth and the rotational level dependence of the fluorescence quantum yield for each radical. These systematic errors cannot be determined through goodness-of-fit criteria and they are much larger than the statistical precision of the measurement. The severity of these problems is different for each radical; careful attention to the experimental design details for each species is necessary to obtain accurate LIF temperature measurements.
Collapse
|
35
|
Copeland RA, Wise ML, Rensberger KJ, Crosley DR. Time resolved laser induced fluorescence of the NH radical in low pressure N(2)O flames. APPLIED OPTICS 1989; 28:3199-3205. [PMID: 20555670 DOI: 10.1364/ao.28.003199] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Total removal rate constants from the NH(A(3)II(i)) electronic state have been obtained in low pressure (~14-Torr) N(2)O flames. The fluorescence decay constants and quantum yields Phi depend on the temperature and composition at each position interrogated in the flame. In similar conditions, Phi for NH(A(3)II(u)) is significantly greater than that for other radicals CH(A(2)Delta and B(2)Sigma(-)) and OH(A(2)Sigma(+)). A small decrease (~5%) in the electronic removal is observed with rotational excitation increasing from N' = 2 to 12 in the A state. Estimates of collisional quenching cross sections at flame temperatures are made for the important combustion species, H(2)O, C(3)H(8), C(2)H(4), and C(2)H(2).
Collapse
|
36
|
Kenner RD, Kaes A, Browarzik RK, Stuhl F. Lifetime and deactivation of NH and ND (A 3Π,v=0 and 1). J Chem Phys 1989. [DOI: 10.1063/1.457104] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|