Rotational cooling of molecules using lamps

Vogelius, I.R.; Madsen, Lars Bojer; Drewsen, Michael

doi:10.1088/0953-4075/37/22/015

Cited by 18 publications

(19 citation statements)

References 13 publications

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“…10(a) provides a versatile means to produce translationally cold molecules, but in general the internal degrees of freedom are not equilibrated [205]; inelastic collisions between ions typically do not occur because the Coulomb force prevents the close approach of the ions, and thus the vibrationrotation temperature of the ions is that of the environment, typically room temperature. Spectroscopic pumping schemes have been proposed to achieve internal cooling of trapped molecular ions [206][207][208][209].…”

Section: Trapping Ionsmentioning

confidence: 99%

Ultracold molecules and ultracold chemistry

2009

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Section: Trapping Ionsmentioning

confidence: 99%

Ultracold molecules and ultracold chemistry

2009

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“…At the present experimental conditions some rotational excitations still exist. The rotational temperature has been estimated to be above 120 K. 12 Additional schemes for rotational cooling of MgH + have been proposed by Vogelius et al [13][14][15] The translational degrees of freedom of the molecular ions are sympathetically cooled by the Coulomb interactions with the remaining laser-cooled magnesium ions in the trap. Taking into account the prospect of rotational cooling, the initial state of the reactant MgH + in this photodissociation study is in the lowest internal state of the ground electronic state X 1 ⌺, e.g., = 0 and J =0.…”

Section: The Photodissociation Scheme Of Mgh +mentioning

confidence: 99%

“…Schemes to further cool the MgH + molecular ion are under inversitigation. [13][14][15] The scheme for the photodissociation process is presented in Sec. II.…”

Section: Introductionmentioning

confidence: 99%

Intensity and wavelength control of a single molecule reaction: Simulation of photodissociation of cold-trapped MgH+

Jørgensen

Drewsen

Kosloff

2005

The Journal of Chemical Physics

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Photodissociation of cold magnesium hydride ions MgH(+) leading to either Mg(+)+H or Mg+H(+) is simulated from first principles. The purpose is to study the possibility of single molecule control of the products in the presence of two laser fields. The system evolves on four electronic potential-energy curves, X(1) Sigma, A(1) Sigma, B(1) Pi, and C(1) Sigma. These potential-energy curves are calculated from first principles using multireference self-consistent field theory. The accuracy of the electronic potential curves has been checked by calculating the energies of the rovibrational eigenstates and comparing them to experimental findings. The photodissociation dynamics has furthermore been simulated by solving the time-dependent Schrodinger equation. It is shown that the branching ratio of the two dissociation channels, Mg(+)+H or Mg+H(+), can be controlled by changing the intensity and wavelength of the two driving laser fields.

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“…As in these latter coherent control propositions, our approach uses a shaped pulsed laser, but it is based on an incoherent process of depopulation pumping with a train of several identical weak femtosecond laser pulses. More closely related to our work is the proposition of using a tailored incoherent broadband light source for rotational cooling of molecular ions (19,20).…”

mentioning

confidence: 91%

Optical Pumping and Vibrational Cooling of Molecules

Viteau

Chotia

Allegrini

et al. 2008

Science

277

285

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The methods producing cold molecules from cold atoms tend to leave molecular ensembles with substantial residual internal energy. For instance, Cs 2 molecules initially formed via photoassociation of cold Cs atoms are in several vibrational levels, v, of the electronic ground state. Here we apply a broadband femtosecond laser that redistributes the vibrational population in the ground state via a few electronic excitation -spontaneous emission cycles. The laser pulses are shaped to remove the excitation frequency band of the v = 0 level, preventing re-excitation from that state. We observe a fast and efficient accumulation, ∼ 70% of the initially detected molecules, in the lowest vibrational level, v = 0, of the singlet electronic state. The validity of this incoherent depopulation pumping method is very general and opens exciting prospects for laser cooling and manipulation of molecules.

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Rotational cooling of molecules using lamps

Cited by 18 publications

References 13 publications

Ultracold molecules and ultracold chemistry

Ultracold molecules and ultracold chemistry

Intensity and wavelength control of a single molecule reaction: Simulation of photodissociation of cold-trapped MgH+

Optical Pumping and Vibrational Cooling of Molecules

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