Mapping molecular dynamics (Na2) in intense laser fields: another dimension to femtochemistry

Frohnmeyer, T.; Hofmann, Martin; Strehle, M.; Baumert, Thomas

doi:10.1016/s0009-2614(99)00895-7

Cited by 51 publications

(25 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In fact, the experiments on multiphoton three-state resonance ionization with an ultrashort intense laser pulse have been carried out by several groups on the alkali dimer [10,25,28]. Therefore it is surprising that no reports have appeared until now on AT splitting of vibrational coherent states.…”

mentioning

confidence: 99%

Autler-Townes Splitting in the Multiphoton Resonance Ionization Spectrum of Molecules Produced by Ultrashort Laser Pulses

Lou

2003

Phys. Rev. Lett.

View full text Add to dashboard Cite

We report for the first time the proper conditions to observe Autler-Townes splitting (ac-Stark splitting) from vibrationally coherent states belonging to the different electronic terms of a diatomic molecule. Wave packet dynamics simulations demonstrate that such a process is feasible by multiphoton resonance ionization of the molecule Na 2 with a single ultrashort intense laser pulse. With the ultrahigh time resolution of a femtosecond laser pulse, one can directly measure the absolute value of the transition dipole moment between any kinds of molecular states by this kind of Autler-Townes splitting, which is a function of the internuclear distance R. DOI: 10.1103/PhysRevLett.91.023002 PACS numbers: 33.80.-b, 42.50.-p Atomic Autler-Townes (AT) splitting has been observed on a radio-frequency transition for a long time [1], but AT splitting in a gas-phase molecule has only recently been investigated [2 -6]. Quesada et al. [2] reported the transition dipole moment of H 2 by measuring the ratio of AT splitting to the electric field strength. Qi et al. demonstrated that the transition dipole moment of the lithium dimer could be measured by AT splitting using cw triple resonance spectroscopy [5,6]. AT splitting on the Na atom [7] and a semiconductor [8] with an ultrashort intense pulse have also been explored recently [8]. But, perhaps, because of the relatively small size of the typical molecular transition dipole moment, few papers reported any result about molecular AT splitting on vibrationally coherent states with an ultrashort laser pulse.In this Letter, with multiphoton ionization wave packet dynamics simulations, we demonstrate that one can observe AT splitting in the photoelectron spectrum with a proper single laser pulse and a prototype dimer Na 2 . Because of the direct relation of AT splitting with the local transition dipole moment and the intensity of the electric field, AT splitting can be used to precisely measure, in principle, the peak intensity of the laser pulse if the transition dipole moment is known, which is not easy to accurately determine. On the other hand, one can also measure the internuclear-distance R-dependent local transition dipole moment by AT splitting with a properly localized wave packet if the intensity of the ultrashort laser pulse is known.Along with the development of the ultrashort laser pulse, real-time molecular dynamics has been directly observed and many new phenomena have been investigated [9-13] and will be discovered. In explanation and foreseeing the experimental results, quantum wave packet dynamics simulations play the central role [14 -18]. In order to entail the excitation of a local coherent wave packet with the common available femtosecond laser system, one must choose the target molecule characterized by small vibrational energy. From this point of view, the sodium dimer is an excellent prototype molecule [12,16 -18], also for its detailed information of potential energy curves and that of its single cation [19,20]. Therefore we employed a model of the s...

show abstract

mentioning

confidence: 99%

Autler-Townes Splitting in the Multiphoton Resonance Ionization Spectrum of Molecules Produced by Ultrashort Laser Pulses

Lou

2003

Phys. Rev. Lett.

View full text Add to dashboard Cite

show abstract

“…[47][48][49][50][51] In particular, using the Na 2 system as a model, they made the first studies of ATI photoelectron spectra as a function of time, using intense 40 fs pulses at 618 nm. This study (and following studies 52 ) showed in detail how TRPES maps the alteration of nuclear dynamics in intense laser fields, using sweeping resonances as a new tool for controlling molecular dynamics. Y. Chen and coworkers also reported the observation of intensity effects on time-resolved PE spectra, using 2 + 1 ionization of NO through its C 2 Π Rydberg state.…”

Section: Intensity Effectsmentioning

confidence: 67%

“…Baumert also studied intensity effects on the coherent control of wave packet dynamics of threshold 52 and above-threshold ionization (ATI) 48 photoelectrons, as well as the chirp-and pulse-length dependence of molecular photoionization dynamics. 74 The first TRPES experiments on metal cluster anions were performed by Ganteför et al 75 in 1998 on Au 3 -.…”

Section: Time-resolved Photoelectron Spectroscopy Experimentsmentioning

confidence: 99%

Femtosecond Time‐Resolved Photoelectron Spectroscopy

2004

View full text Add to dashboard Cite

Access and use of this website and the material on it are subject to the Terms and Conditions set forth at NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=12338387&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=12338387&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca.

show abstract

“…The analysis of the physical mechanisms is practicable in the weak field regime but rather the exception to the rule in strong laser fields. Examples of strong field open loop mechanisms are the RAP (rapid adiabatic passage) [6,7], the STIRAP (stimulated Raman adiabatic passage) [8] and the modification of the potential surfaces due to the AC-Stark effect [9][10][11]. An alternative approach based on the use of the combination of pulse shaping techniques [12] with adaptive feedback learning loops (closed loop) was suggested [13] for the case when the underlying potential surfaces are unknown.…”

Section: Introductionmentioning

confidence: 99%

Strong field quantum control by selective population of dressed states

Wollenhaupt

Präkelt

Sarpe-Tudoran

et al. 2005

J. Opt. B: Quantum Semiclass. Opt.

View full text Add to dashboard Cite

We study the dynamics of potassium atoms in intense laser fields using femtosecond phase-locked pulse pairs in order to extract physical mechanisms of strong field quantum control. The structure of the Autler-Townes (AT) doublet in the photoelectron spectra is measured to analyse transient processes. The analysis shows that the physical mechanism is based on the selective population of dressed states (SPODS). Experimental results of closed loop optimization of SPODS are presented in addition. Applications to decoherence measurements with implications for quantum information are also proposed.

show abstract

Mapping molecular dynamics (Na2) in intense laser fields: another dimension to femtochemistry

Cited by 51 publications

References 28 publications

Autler-Townes Splitting in the Multiphoton Resonance Ionization Spectrum of Molecules Produced by Ultrashort Laser Pulses

Autler-Townes Splitting in the Multiphoton Resonance Ionization Spectrum of Molecules Produced by Ultrashort Laser Pulses

Femtosecond Time‐Resolved Photoelectron Spectroscopy

Strong field quantum control by selective population of dressed states

Contact Info

Product

Resources

About