Fine- and hyperfine-structure effects in molecular photoionization. II. Resonance-enhanced multiphoton ionization and hyperfine-selective generation of molecular cations

Germann, Matthias; Willitsch, Stefan

doi:10.1063/1.4955303

Cited by 7 publications

(5 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The relative intensities of the hyperfine transitions are governed by the 6j-symbol on the last line of Eq. (28). A propensity towards transitions obeying the relation ∆J = ∆F is observed, similar as has previously been observed in bound-bound hyperfine-resolved transitions.…”

Section: B Example 2: Hyperfine Propensities In the Photoionization supporting

confidence: 84%

See 1 more Smart Citation

Fine- and hyperfine-structure effects in molecular photoionization. I. General theory and direct photoionization

Germann

Willitsch

2016

The Journal of Chemical Physics

Self Cite

View full text Add to dashboard Cite

We develop a model for predicting fine-and hyperfine intensities in the direct photoionization of molecules based on the separability of electron and nuclear spin states from vibrational-electronic states. Using spherical tensor algebra, we derive highly symmetrized forms of the squared photoionization dipole matrix elements from which we derive the salient selection and propensity rules for fineand hyperfine resolved photoionizing transitions. Our theoretical results are validated by the analysis of the fine-structure resolved photoelectron spectrum of O 2 reported by Palm and Merkt [Phys. Rev. Lett. 81, 1385 (1998)] and are used for predicting hyperfine populations of molecular ions produced by photoionization. Published by AIP Publishing. [http://dx

show abstract

Section: B Example 2: Hyperfine Propensities In the Photoionization supporting

confidence: 84%

“…16 and of hyperfine propensities in the photoionization of N 2 . In Paper II, 28 we extend our model to resonance-enhanced multiphotonionization processes and address the problem of hyperfinepreparation of molecular cations.…”

Section: Introductionmentioning

confidence: 99%

Fine- and hyperfine-structure effects in molecular photoionization. I. General theory and direct photoionization

Germann

Willitsch

2016

The Journal of Chemical Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Although the present REMPI scheme allows us to initialize the molecular ion in a specific rovibrational (quantum numbers v, N ) state, the fine, hyperfine and Zeeman structure (quantum numbers J,F ,m F ) are not resolved in the ionization step with the current laser system. Hyperfine-selective REMPI schemes can be devised using more narrow-bandwidth lasers 58,59 . For the present purpose in order to prepare the molecule in a specific (J, F, m F ) state, a projective pumping scheme 40 is envisaged to be further discussed in Sec.…”

Section: Preparationmentioning

confidence: 99%

State-selective coherent motional excitation as a new approach for the manipulation, spectroscopy and state-to-state chemistry of single molecular ions

et al. 2019

Self Cite

View full text Add to dashboard Cite

We present theoretical and experimental progress towards a new approach for the precision spectroscopy, coherent manipulation and state-to-state chemistry of single isolated molecular ions in the gas phase. Our method consists of a molecular beam for creating packets of rotationally cold neutrals from which a single molecule is state-selectively ionized and trapped inside a radiofrequency ion trap. In addition to the molecular ion, a single co-trapped atomic ion is used to cool the molecular external degrees of freedom to the ground state of the trap and to detect the molecular state using state-selective coherent motional excitation from a modulated optical-dipole force acting on the molecule. We present a detailed discussion and theoretical characterization of the present approach. We simulate the molecular signal experimentally using a single atomic ion indicating that different rovibronic molecular states can be resolved and individually detected with our method. The present approach for the coherent control and non-destructive detection of the quantum state of a single molecular ion opens up new perspectives for precision spectroscopies relevant for, e.g., tests of fundamental physical theories and the development of new types of clocks based on molecular vibrational transitions. It will also enable the observation and control of chemical reactions of single particles on the quantum level. While focusing on N + 2 as a prototypical example in the present work, our method is applicable to a wide range of diatomic and polyatomic molecules.

show abstract

“…Finally, the hyperfine state selectivity of the REMPI process [39] is also an interesting topic for further investigations, with the perspective of producing hydrogen molecular ions in a single internal quantum state.…”

Section: Discussionmentioning

confidence: 99%

Trapping, cooling, and photodissociation analysis of state-selected H$\_2^+$ ions produced by (3+1) multiphoton ionization

Schmidt,

Louvradoux,

Heinrich

et al. 2020

Preprint

View full text Add to dashboard Cite

We report on the production of cold, state-selected H + 2 molecular ions in a linear RF trap. The ions are produced by (3+1) resonance-enhanced multi-photon ionisation (REMPI) of H2, and sympathetically cooled by laser-cooled Be + ions. After demonstrating and characterizing the REMPI process, we use photodissociation by a deep UV laser at 213 nm to verify the high vibrational purity of the produced H + 2 ion samples. Moreover, the large difference between the photodissociation efficiencies of ions created in the v = 0 and v = 1 levels provides a way to detect a v = 0 → 1 transition. These results pave the way towards high-resolution vibrational spectroscopy of H + 2 for fundamental metrology applications.

show abstract

Fine- and hyperfine-structure effects in molecular photoionization. II. Resonance-enhanced multiphoton ionization and hyperfine-selective generation of molecular cations

Cited by 7 publications

References 39 publications

Fine- and hyperfine-structure effects in molecular photoionization. I. General theory and direct photoionization

Fine- and hyperfine-structure effects in molecular photoionization. I. General theory and direct photoionization

State-selective coherent motional excitation as a new approach for the manipulation, spectroscopy and state-to-state chemistry of single molecular ions

Trapping, cooling, and photodissociation analysis of state-selected H$\_2^+$ ions produced by (3+1) multiphoton ionization

Contact Info

Product

Resources

About