Rotationally resolved photoionization dynamics of hot CO fragmented from OCS

Rijs, Anouk M.; Backus, Ellen H. G.; Lange, C.A. de; Janssen, Maurice H. M.; Westwood, N. P. C.; Wang, Kwanghsi; McKoy, Vincent

doi:10.1063/1.1434993

Cited by 30 publications

(14 citation statements)

References 36 publications

(33 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The bimodal structure of the CO(J) rotational distribution reported before 19,[21][22][23][26][27]34 is very clearly observed in Fig. 2.…”

Section: Resultssupporting

confidence: 62%

“…The rotational energy of CO(J) was calculated using the rotational constants reported before. 27 The third collumn contains the value of the anisotropy parameter b exp (J CO ) as measured in a separate two-laser experiment with photolysis at 42 594 cm À1 and a probe laser around 230 nm detecting a single rotationally quantum state-selected CO(J) cofragment. The b exp (J CO ) reported is the value directly obtained from the angular distribution of the slice image of CO(J), without the small correction for the alignment of the parent OCS(v 2 = 1|JlM = 111) state, see eqn (3).…”

Section: Downloaded By Radboud Universiteit Nijmegen On 06 November 2012mentioning

confidence: 99%

See 1 more Smart Citation

Towards the complete experiment: measurement of S(1D2) polarization in correlation with single rotational states of CO(J) from the photodissociation of oriented OCS(v2 = 1|JlM = 111)

Lipciuc

Rakitzis

Meerts

et al. 2011

Phys. Chem. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

In this paper we report slice imaging polarization experiments on the state-to-state photodissociation at 42,594 cm(-1) of spatially oriented OCS(v(2) = 1|JlM = 111) → CO(J) + S((1)D(2)). Slice images were measured of the three-dimensional recoil distribution of the S((1)D(2)) photofragment for different polarization geometries of the photolysis and probe laser. The high resolution slice images show well separated velocity rings in the S((1)D(2)) velocity distribution. The velocity rings of the S((1)D(2)) photofragment correlate with individual rotational states of the CO(J) cofragment in the J(CO) = 57-65 region. The angular distribution of the S((1)D(2)) velocity rings are extracted and analyzed using two different polarization models. The first model assumes the nonaxial dynamics evolves after excitation to a single potential energy surface of an oriented OCS(v(2) = 1|JlM = 111) molecule. The second model assumes the excitation is to two potential energy surfaces, and the OCS molecule is randomly oriented. In the high J region (J(CO) = 62-65) it appears that both models fit the polarization very well, in the region J(CO) = 57-61 both models seem to fit the data less well. From the molecular frame alignment moments the m-state distribution of S((1)D(2)) is calculated as a function of the CO(J) channel. A comparison is made with the theoretical m-state distribution calculated from the long-range electrostatic dipole-dipole plus quadrupole interaction model. The S((1)D(2)) photofragment velocity distribution shows a very pronounced strong peak for S((1)D(2)) fragments born in coincidence with CO(J = 61).

show abstract

“…The bimodal structure of the CO(J) rotational distribution reported before 19,[21][22][23][26][27]34 is very clearly observed in Fig. 2.…”

Section: Resultssupporting

confidence: 62%

Section: Downloaded By Radboud Universiteit Nijmegen On 06 November 2012mentioning

confidence: 99%

Towards the complete experiment: measurement of S(1D2) polarization in correlation with single rotational states of CO(J) from the photodissociation of oriented OCS(v2 = 1|JlM = 111)

Lipciuc

Rakitzis

Meerts

et al. 2011

Phys. Chem. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…20 The details of photofragmentation in the first absorption band have been the focus of many experimental studies. [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] The absorption cross section increases significantly with excitation of the bending mode in the ground state. 28,32,36 The fragmentation yields sulfur atoms in both the singlet and triplet states with a branching ratio of about 0.95:0.05 at the absorption peak.…”

Section: Introductionmentioning

confidence: 99%

The ultraviolet spectrum of OCS from first principles: Electronic transitions, vibrational structure and temperature dependence

Schmidt

Johnson

McBane

et al. 2012

The Journal of Chemical Physics

View full text Add to dashboard Cite

Global three dimensional potential energy surfaces and transition dipole moment functions are calculated for the lowest singlet and triplet states of carbonyl sulfide at the multireference configuration interaction level of theory. The first ultraviolet absorption band is then studied by means of quantum mechanical wave packet propagation. Excitation of the repulsive 2 1 A state gives the main contribution to the cross section. Excitation of the repulsive 1 1 A state is about a factor of 20 weaker at the absorption peak (E ph ≈ 45 000 cm −1 ) but becomes comparable to the 2 1 A state absorption with decreasing energy (35 000 cm −1 ) and eventually exceeds it. Direct excitation of the repulsive triplet states is negligible except at photon energies E ph < 38 000 cm −1 . The main structure observed in the cross section is caused by excitation of the bound 2 3 A state, which is nearly degenerate with the 2 1 A state in the Franck-Condon region. The structure observed in the low energy tail of the spectrum is caused by excitation of quasi-bound bending vibrational states of the 2 1 A and 1 1 A electronic states. The absorption cross sections agree well with experimental data and the temperature dependence of the cross section is well reproduced.

show abstract

“…The rotational constants used for the simulation are listed in Table I. 24,25 It is seen that the bandhead of the CO ͑B 1 ͚ + ← ←X 1 ͚ + ͒ Q-branch is rotationally resolved. We also recorded the one-color DF REMPI for this system under the same experimental conditions for comparison.…”

Section: Resultsmentioning

confidence: 99%

State-selected imaging of HCCO radical photodissociation dynamics

Huang

Estillore²,

Suits³

2008

The Journal of Chemical Physics

View full text Add to dashboard Cite

We present a dc sliced ion imaging study of HCCO radical photodissociation to CH and CO at 230 nm. The measurements were made using a two-color reduced Doppler probe strategy. The CO rotational distribution was consistent with a Boltzmann distribution at 3500 K. Using the dc slice ion imaging approach, we obtained CO images for various rotational levels of CO (v=0). The results are largely consistent with earlier work, albeit with a significant 0.9 eV peak seen previously in the translational energy distributions absent in our state-selected imaging study.

show abstract

Rotationally resolved photoionization dynamics of hot CO fragmented from OCS

Cited by 30 publications

References 36 publications

Towards the complete experiment: measurement of S(1D2) polarization in correlation with single rotational states of CO(J) from the photodissociation of oriented OCS(v2 = 1|JlM = 111)

Towards the complete experiment: measurement of S(1D2) polarization in correlation with single rotational states of CO(J) from the photodissociation of oriented OCS(v2 = 1|JlM = 111)

The ultraviolet spectrum of OCS from first principles: Electronic transitions, vibrational structure and temperature dependence

State-selected imaging of HCCO radical photodissociation dynamics

Contact Info

Product

Resources

About