Thema der Dissertation:
Broken Patterns - Anomalies in the Spectra of Aluminum Monofluoride
Broken Patterns - Anomalies in the Spectra of Aluminum Monofluoride
Abstract: The spectra of diatomic molecules are often described successfully using a small set of parameters. However, in certain cases the observed spectra deviate significantly from the expectations: lines that should appear are missing, new lines emerge unexpectedly, and others are shifted from their predicted positions. These anomalies frequently originate from interactions among different electronic states.
In this talk, I will discuss several anomalies observed in the UV and visible spectra of aluminum monofluoride (AlF), a molecule with particularly favorable properties for laser cooling. Both the strong A¹Π ← X¹Σ⁺ band near 227 nm and the narrow a³Π ← X¹Σ⁺ band near 367 nm have rotationally and vibrationally closed transitions, making them well-suited for efficient photon scattering.
The weak, spin-forbidden a³Π ← X¹Σ⁺ band gains intensity through spin–orbit coupling between the metastable a³Π state and distant singlet states, enabling its use in laser cooling schemes. Near-degeneracy between the A¹Π, v = 6 and b³Σ⁺, v = 5 states leads to levels with strongly mixed spin character that can act as a singlet–triplet doorway. Strong interactions between the nearby d³Π and e³Δ Rydberg states modify their equilibrium rotational constants, giving rise to an unexpected and anomalous rotational pattern in one particular band.
The in-depth analysis of these anomalies opens new opportunities for optical laser cooling and trapping experiments.
In this talk, I will discuss several anomalies observed in the UV and visible spectra of aluminum monofluoride (AlF), a molecule with particularly favorable properties for laser cooling. Both the strong A¹Π ← X¹Σ⁺ band near 227 nm and the narrow a³Π ← X¹Σ⁺ band near 367 nm have rotationally and vibrationally closed transitions, making them well-suited for efficient photon scattering.
The weak, spin-forbidden a³Π ← X¹Σ⁺ band gains intensity through spin–orbit coupling between the metastable a³Π state and distant singlet states, enabling its use in laser cooling schemes. Near-degeneracy between the A¹Π, v = 6 and b³Σ⁺, v = 5 states leads to levels with strongly mixed spin character that can act as a singlet–triplet doorway. Strong interactions between the nearby d³Π and e³Δ Rydberg states modify their equilibrium rotational constants, giving rise to an unexpected and anomalous rotational pattern in one particular band.
The in-depth analysis of these anomalies opens new opportunities for optical laser cooling and trapping experiments.
Zeit & Ort
13.10.2025 | 12:15
Seminarraum 1.1.16
(Fachbereich Physik, Arnimallee 14, 14195 Berlin)