A (3+1) resonance enhanced multiphoton ionization study of the <i>C</i> 1Σ+ and <i>E</i> 1Π states of CO: Polarization dependence used to probe electronic excitation routes and electronic character

Koeckhoven, S. M.; Lange, C.A. de

doi:10.1063/1.466006

Cited by 10 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the vibrational frequencies of CO (C 1 ⌺ ϩ ) and CO(X 1 ⌺ ϩ ) are very similar, the Q-bandheads of the ͑1-1͒ and ͑0-0͒ sitions are separated by only 1.2 cm Ϫ1 . 27 This proximity leads to spectral overlap in the 2ϩ1 REMPI spectrum; i.e., CO͑ϭ1͒ is superimposed on CO͑ϭ0, Jу10͒. However the difference of Ϸ2100 cm Ϫ1 in the translational energies available to CO ϭ0 and 1 results in a clear spatial separation of their contributions in the images.…”

Section: Shown Inmentioning

confidence: 99%

Photofragment imaging of HNCO decomposition: Angular anisotropy and correlated distributions

Sanov

Droz‐Georget

Zyrianov

et al. 1997

The Journal of Chemical Physics

View full text Add to dashboard Cite

Photodissociation of jet-cooled isocyanic acid has been examined by photofragment ion imaging of H͑D͒ from H͑D͒NCO and CO from HNCO, and by laser induced fluorescence ͑LIF͒ of NH(a 1 ⌬) from HNCO. Only modest recoil anisotropy is observed in the HϩNCO channel at 243.1 nm ͑␤ϭϪ0.13Ϯ0.05͒, while the DϩNCO channel at approximately the same wavelength reveals no anisotropy ͑␤ϭ0.00Ϯ0.05͒, confirming that the dissociation of H͑D͒NCO from the opening of the H͑D͒ channel proceeds via vibrational predissociation on the S 0 (1 AЈ) surface. In contrast, substantial anisotropy ͑␤ϭϪ0.66Ϯ0.08͒ is observed in the NH(a 1 ⌬)ϩCO channel at 230.1 nm, but this value can correspond to dissociation on either S 0 or S 1. The photolysis region between 243 and 230 nm thus appears important in providing clues to the dissociation mechanism and the competition between different potential energy surfaces. At 217.6 nm, product state distributions exhibit clear dynamical biases. CO is produced in both ϭ0 and ϭ1, while NH(a 1 ⌬) distributions correlated with different rovibrational levels of CO, although different in shape, are always cold, consistent with the global NH distribution measured by LIF. The NH distributions indicate dissociation on S 1 (1 AЉ), and can be described by Franck-Condon mapping of transition state wave functions in the HNC bending coordinate without additional torque, implying little anisotropy in the potential along that coordinate. On the other hand, a larger torque is manifest in the CO rotational distribution. Although at 217.6 nm the dissociation is likely to be dominated by decomposition on S 1 , competition with radiationless decay is still manifest. From analysis of the CO photofragment velocity distribution at 230.1 nm, the NH(a 1 ⌬)ϩCO dissociation threshold is determined at 42 765 Ϯ 25 cm Ϫ1 .

show abstract

Section: Shown Inmentioning

confidence: 99%

Photofragment imaging of HNCO decomposition: Angular anisotropy and correlated distributions

Sanov

Droz‐Georget

Zyrianov

et al. 1997

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…The experimental setup is similar to the one used in previous multiphoton ionization studies, 17 and therefore only a summary will be given. The laser system consists of an excimer pumped dye laser ͑bandwidth 0.08 cm Ϫ1 ͒ which operated on the dye rhodamine 6G.…”

Section: Methodsmentioning

confidence: 99%

A resonance enhanced multiphoton ionization study of the gerade excited states of Xe2 with a Xe 1S+Xe* 6s[3/2]1 dissociation limit

Koeckhoven

Buma

Lange

1995

The Journal of Chemical Physics

Self Cite

View full text Add to dashboard Cite

A resonance enhanced multiphoton ionization study of the gerade excited states of XeC2 with a Xe E1SC0 + XeE* 6s[3/2]C1 dissociation limit Koeckhoven, S.M.; Buma, W.J.; de Lange, C.A. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Low-lying gerade electronically excited states of the Xe dimer, viz., 1 g and 0 g ϩ , with a Xe 1 S 0 ϩXe* 6s[3/2] 1 dissociation limit have been investigated using two-photon resonance enhanced multiphoton ionization techniques. High resolution is achieved by using this method in combination with a supersonic expansion. Moreover, the mass-resolved ion detection used in the present experiments has led to the observation of both vibrationally well-resolved spectra and continuous features, allowing the bound and dissociative parts of the excited states to be investigated separately. All spectra have been measured under both linearly and circularly polarized excitation conditions, enabling an unambiguous assignment of the signals. On the basis of FranckCondon calculations information on the potential energy curves of the bound and dissociative parts of the excited states has been obtained.

show abstract

“…A number of papers describing REMPI spectroscopy of CO have been published. [23][24][25][26][27][28][29][30][31][32][33][34][35] A partial energy level diagram for CO is shown in Fig. 1.…”

Section: Molecular Spectroscopy Involved In Rempi Of Comentioning

confidence: 99%

Urban air pollution monitoring: laser-based procedure for the detection of carbon monoxide gas

Wu¹,

Singhal²,

McCanny³

1998

Analyst

View full text Add to dashboard Cite

Urban air quality is of considerable importance in many cities throughout Europe and the USA. In particular, current EU legislation has driven an expansion of monitoring of more pollutants at more sites. At present in the UK, real time readings are now available for benzene, buta-1,3-diene and other volatile organic compounds, airborne fine dust (PM10), CO, 03, SO2, and NOX. Carbon monoxide is produced to varying degrees in all combustion processes but more than 90% is caused by emissions from petrol vehicle exhausts. The World Health Ogranisation guidelines for exposure to the gas is < 10 ppm for 8 h and 85 ppm for periods not exceeding 15 min. All the pollutants mentioned above are monitored by different detection techniques and it has been the authors' philosophy to develop instrumentation which can monitor all the different pollutants using a single detector. To this end, a multiphoton laser based procedure, using simple ionization chambers, has been developed to detect the different pollutants with different wavelengths. For CO, a 2 + 1 resonance enhanced multiphoton ionization (REMPI) scheme at 230 nm can be used with detection limits of about 1 ppm.

show abstract

A (3+1) resonance enhanced multiphoton ionization study of the C 1Σ+ and E 1Π states of CO: Polarization dependence used to probe electronic excitation routes and electronic character

Cited by 10 publications

References 24 publications

Photofragment imaging of HNCO decomposition: Angular anisotropy and correlated distributions

Photofragment imaging of HNCO decomposition: Angular anisotropy and correlated distributions

A resonance enhanced multiphoton ionization study of the gerade excited states of Xe2 with a Xe 1S+Xe* 6s[3/2]1 dissociation limit

Urban air pollution monitoring: laser-based procedure for the detection of carbon monoxide gas

Contact Info

Product

Resources

About