Photodissociation of oriented HXeI molecules in the gas phase

Baumfalk, Reinhard; Nahler, N. Hendrik; Buck, U.

doi:10.1063/1.1354144

Cited by 59 publications

(38 citation statements)

References 17 publications

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“…A key issue is dynamical alignment, a field that recently saw the first demonstration of linear alignment (Rosca-Pruna and Vrakking, 2001). First experimental demonstrations of orientation through a combination of a laser field and a static electric field (Friedrich and Herschbach, 1999) were recently reported (Baumfalk, Nahler, and Buck, 2001;Sakai et al, 2003). Experimental tests of other intense-laserbased schemes (Henriksen, 1999;Averbukh and Arvieu, 2001;Dion, Keller, and Atabek, 2001;Machholm and Henriksen, 2001;Dion et al, 2002;Guerin et al, 2002) may be expected to form another topic of future experimental research.…”

Section: Discussionmentioning

confidence: 99%

“…During the past few years the field of intense laser alignment has been growing rapidly, with an ever increasing number of contributions from both experimental Felker, 1996, 1997;Larsen et al, 1998Larsen et al, , 2000Sakai, Safvan, 1998;Lappas and Marangos, 2000;Baumfalk, Nahler, and Buck, 2001;Rosca-Pruna and Vrakking, 2001, 2002a, 2002bVelotta et al, 2001;Bartels et al, 2002;Poulsen, Skovsen, and Stapelfeldt, 2002;Sakai et al, 2002) and theoretical (Friedrich and Herschbach, 1995aSeideman, 1995bSeideman, , 1999aSeideman, , 1999bSeideman, , 2001aSukharev and Krainov, 1998;Andryushin and Fedorov, 1999;Dion, Bandrauk, Atabek, Keller, Umeda, and Fujimura, 1999;Henriksen, 1999;Ortigoso et al, 1999;Yan and Seideman, 1999;Keller, Dion, and Atabek, 2000;Larsen et al, 2000;Legare, Chelkowski, and Bandrauk, 2000;Averbukh and Arvieu, 2001;Cai, Marango, and Friedrich, 2001;Dion, Keller, and Atabek, 2001;Hoki and Fujimura, 2001;Machholm, 2001;Machholm and Henriksen, 2001;Dion et al, 2002;Guerin et al, 2002;Kalosha et al, 2002;Van Leuven, Malvaldi, and Persico, 2002) research. Recent work has analyzed the role played by various system...…”

Section: Introductionmentioning

confidence: 99%

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Colloquium: Aligning molecules with strong laser pulses

Stapelfeldt¹,

2003

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Colloquium: Aligning molecules with strong laser pulses

Stapelfeldt¹,

2003

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“…As suggested by Friedrich and Herschbach a decade ago [16,17], and later demonstrated experimentally [10,[18][19][20][21], orientation can be added to alignment by combining the strong laser field with a weak static electric field. Therefore, we use 1D orientation to denote 1D alignment and, simultaneously, a preferred direction of the permanent dipole moment.…”

Section: Introductionmentioning

confidence: 99%

Laser-induced 3D alignment and orientation of quantum state-selected molecules

Nevo

Holmegaard

Nielsen

et al. 2009

Phys. Chem. Chem. Phys.

109

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A strong inhomogeneous static electric field is used to spatially disperse a rotationally cold supersonic beam of 2,6-difluoroiodobenzene molecules according to their rotational quantum state. The molecules in the lowest lying rotational states are selected and used as targets for 3-dimensional alignment and orientation. The alignment is induced in the adiabatic regime with an elliptically polarized, intense laser pulse and the orientation is induced by the combined action of the laser pulse and a weak static electric field. We show that the degree of 3-dimensional alignment and orientation is strongly enhanced when rotationally state-selected molecules, rather than molecules in the original molecular beam, are used as targets. 36.40.Wa

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“…Only the last method has been experimentally demonstrated on OCS 9,27 and on HXeI (ref. 28) and iodobenzene 29 molecules. The degree of orientation that can be achieved very sensitively depends on the rotational temperature of the molecular sample.…”

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confidence: 99%

Impulsive orientation and alignment of quantum-state-selected NO molecules

et al. 2009

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Manipulation of the molecular-axis distribution is an important ingredient in experiments aimed at understanding and controlling molecular processes 1-6 . Samples of aligned or oriented molecules can be obtained following the interaction with an intense laser field 7-9 , enabling experiments in the molecular rather than the laboratory frame 10-12 . However, the degree of impulsive molecular orientation and alignment that can be achieved using a single laser field is limited 13 and crucially depends on the initial states, which are thermally populated. Here we report the successful demonstration of a new technique for laser-field-free orientation and alignment of molecules that combines an electrostatic field, non-resonant femtosecond laser excitation 14 and the preparation of state-selected molecules using a hexapole 2 . As a unique quantum-mechanical wavepacket is formed, a large degree of orientation and alignment is observed both during and after the femtosecond laser pulse, which is even further increased (to cos θ = −0.74 and cos 2 θ = 0.82, respectively) by tailoring the shape of the femtosecond laser pulse. This work should enable new applications such as the study of reaction dynamics or collision experiments in the molecular frame, and orbital tomography 11 of heteronuclear molecules.The outcome of molecular collision experiments is strongly affected by the angular anisotropies in the initial molecular axis distribution. In bimolecular and molecule-surface collisions, collision cross-sections sensitively depend on the relative arrangement of the collision partners 1,2 . Likewise, photon-molecule collisions such as X-ray diffraction and photodissocation experiments aimed at the elucidation of molecular structure or photochemical activity depend on and can benefit from angular confinement of the sample 3,4 . The two most important moments of the molecular axis distribution are the 'alignment' ( cos 2 θ ) and 'orientation' ( cosθ ), where θ is the angle between the molecular axis and a reference axis.First attempts to orient and align molecules relied on electrostatic fields. A hexapole electric field can be used to stateselect polar molecules and orient them through their first-order Stark effect 2,5 using a moderate field strength. The orientation is limited by the selected state. 'Brute-force orientation' uses a strong homogeneous electrostatic field and relies on the second-and higher-order Stark effect 6 . It requires molecules with a large dipole moment and extremely high electric-field strengths.As a part of extensive efforts aimed at achieving laser-controlled chemistry 15-17 , laser-controlled alignment 8 has attracted considerable attention. Suitably chosen laser fields can exert torques on molecules, exploiting the interaction of the laser field with the molecular polarizability. Both adiabatic alignment, where molecules are exposed to a slowly varying laser field 18 , and non-adiabatic (impulsive) alignment, where molecules align after receiving a kick by a short laser pulse 7 , have been succe...

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Photodissociation of oriented HXeI molecules in the gas phase

Cited by 59 publications

References 17 publications

Colloquium: Aligning molecules with strong laser pulses

Colloquium: Aligning molecules with strong laser pulses

Laser-induced 3D alignment and orientation of quantum state-selected molecules

Impulsive orientation and alignment of quantum-state-selected NO molecules

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