Laser-induced fluorescence detection of HCO produced by laser photolysis of formaldehyde

König, Roland; Lademann, Jürgen

doi:10.1016/0009-2614(83)87563-0

Cited by 38 publications

(5 citation statements)

References 7 publications

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“…The first spectrum arising by an electronic transition in HCO was obtained in absorption for the so-called red band system, between 860-460 nm. 5 That and subsequent studies [6][7][8][9][10][11] determined the presence of the Ã 2 AЉ state correlating, together with the ground state, to the 1 2 ⌸ electronic state at the linear nuclear geometry, their splitting being a consequence of the Renner-Teller effect. In the energy range 410-230 nm the so-called hydrocarbon flame bands appear.…”

Section: Introductionmentioning

confidence: 99%

Vibronic structure in triatomic molecules: The hydrocarbon flame bands of the formyl radical (HCO). A theoretical study

Serrano‐Andrés

Forsberg

Malmqvist

1998

The Journal of Chemical Physics

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A theoretical study of the vibrational structure of the X 2 AЈ ground and B 2 AЈ excited states of the formyl radical, HCO, and its deuterated form, DCO, has been performed. The potential energy surfaces have been computed by means of a multiconfigurational perturbative method, CASPT2. The computed geometries and the harmonic and anharmonic frequencies are successfully compared to the available experimental information. The vibrational intensities of the transition B 2 AЈ↔X 2 AЈ have been computed both for absorption and emission. The results lead to accurate determinations of several structural parameters and some reassignments of the vibrational transitions of the so-called hydrocarbon flame bands of the formyl radical.

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Section: Introductionmentioning

confidence: 99%

Vibronic structure in triatomic molecules: The hydrocarbon flame bands of the formyl radical (HCO). A theoretical study

Serrano‐Andrés

Forsberg

Malmqvist

1998

The Journal of Chemical Physics

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“…5 The recombination reaction of H with CO and competing reactions of the HCO radical are also of great importance in these chemical environments. Previous experimental work on the HCO system has included spectroscopy [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] and photodissociation studies 26 -30 of the radical as well as measurements of cross sections for inelastic HϩCO collisions. [31][32][33][34][35] In addition, the construction of potential energy surfaces [36][37][38][39][40] as well as classical 41,42 and quantum mechanical [43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58] dynamics calculations ha...…”

Section: Introductionmentioning

confidence: 99%

Photodissociation dynamics of state-selected resonances of HCO X̃ 2A′ prepared by stimulated emission pumping

Neyer

Luo

Burak

et al. 1995

The Journal of Chemical Physics

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Articles you may be interested inState-selected imaging studies of formic acid photodissociation dynamics J. Chem. Phys. 132, 154306 (2010); 10.1063/1.3386576 CO product distribution from metastable levels of HCO X2 A' prepared by stimulated emission pumping J. Chem. Phys. 98, 5095 (1993); 10.1063/1.464966 Stateselected photodissociation dynamics of HONO(A1 A'): Characterization of the NO fragmentMetastable resonances on the ground electronic state of the HCO radical have been prepared by stimulated emission pumping. The resonances have energies 5000 to 10 000 cm Ϫ1 above the dissociation limit of HCO and can be assigned by their vibrational and asymmetric-top rotational character. The transition linewidths of the resonances and the rotational and vibrational distributions of the CO dissociation products have been measured. The linewidths show a strong dependence on the vibrational character of the resonance rather than a monotonic dependence on energy, and thus provide an important example of nonstatistical behavior. CO͑vϭ2͒ was produced in the decay of all six resonances studied, while only the three highest energy resonances produced measurable amounts of CO͑vϭ3͒. CO rotational distributions with population in low-J states, which often showed nonstatistical structure, were characteristic of the products from all the resonances studied. The rotational distributions depend both on the vibrational character of the parent state and on the rotational state prepared in the HCO. The experimental results are compared and contrasted with previous quantum mechanical calculations and analyzed in the context of a modified Franck-Condon model for the dissociation.

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“…This fragment of the spectrum includes the R, Q, and part of the P branches of the (090)‐(000) vibrational band of the system. The spectrum was assigned on the basis of the extensive literature data 47‐51 . A complex structure located between the P(17) and P(18) lines is consistent with the position of a “hot” band, which was observed in the experiments with laser photolysis of formaldehyde 51 and acetaldehyde 27 .…”

Section: Resultsmentioning

confidence: 56%

Intracavity Laser Absorption Spectroscopy for flame diagnostics

Rahinov

Gol'dman

Cheskis

2007

Israel Journal of Chemistry

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Intracavity Laser Absorption Spectroscopy (ICLAS) is one of the most sensitive techniques in absorption spectroscopy. Application of this technique to combustion diagnostics offers many important advantages. Since ICLAS is an absorption‐based method, it is not limited by the quenching and predissociation effects that compromise the sensitivity of Laser Induced Fluorescence (LIF), one of the most sensitive and widespread techniques applied in combustion diagnostics. For that reason, radicals that are subject to strong collisional quenching or predissociation, such as 1CH2 and HCO, can be measured by ICLAS with sensitivity much greater than that of LIF. For the same reason, ICLAS also possesses better sensitivity for NH and HNO. The present paper overviews the ICLAS measurements performed during the last decade in our laboratory and also presents recent results: first‐time detection of the HSO radical in flames by ICLAS and application of Fiber Laser Intracavity Absorption Spectroscopy (FLICAS) based on Er‐doped fiber laser for in‐situ detection of ammonia and hydrogen cyanide in a low‐pressure methane/air flame doped with a small amount of ammonia. Avenues for future research are discussed.

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Laser-induced fluorescence detection of HCO produced by laser photolysis of formaldehyde

Cited by 38 publications

References 7 publications

Vibronic structure in triatomic molecules: The hydrocarbon flame bands of the formyl radical (HCO). A theoretical study

Vibronic structure in triatomic molecules: The hydrocarbon flame bands of the formyl radical (HCO). A theoretical study

Photodissociation dynamics of state-selected resonances of HCO X̃ 2A′ prepared by stimulated emission pumping

Intracavity Laser Absorption Spectroscopy for flame diagnostics

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