Two-dimensional (2+n) REMPI of HCl: Observation and characterisation of a new Rydberg state

Two-dimensional (2+n) resonance enhanced multiphoton ionization of HCl: State interactions and photorupture channels via low-energy triplet Rydberg states

“…3͑b͒ is due to the resonance transition g 3 ⌺ + ͑1͒ ← ←X 1 ⌺ + . 24 Other peaks observed in this region are due to the transitions d 3 ⌸͑0 + ͒ ← ←X 1 ⌺ + and D 1 ⌸͑1͒ ← ←X 1 ⌺ + ͑0,0͒. 7 On a relative scale, significant ion signals for all ion species are observed for the V 1 ⌺ + ← ←X 1 ⌺ + ͑8,0͒ and V 1 ⌺ + ← ←X 1 ⌺ + ͑9,0͒ systems, whereas the parent ion signals dominate the REMPI for f 3 ⌬ 2 ← ←X 1 ⌺ + ͑0,0͒, f 3 ⌬ 1 ← ←X 1 ⌺ + ͑0,0͒, and g 3 ⌺ + ͑1͒ ← ←X 1 ⌺ + , in agreement with earlier observations.…”

“…Thus, relative signal intensities are found to be more sensitive measures of state interactions than line shifts. This was proved to be a useful tool in assisting with state assignment 24 and could possibly be used for indirect characterization of hidden states. A model, based on the major photorupture channels mentioned above, is created and used to simulate ion signal data for ionizations via excitations to the Rydberg states.…”

Multiphoton Ionization and Fragmentation of Hydrogen Chloride: A Diatomic Still Good for a Surprise

“…Both groups investigated the ionization/fragmentation pathways through various vibrational bands of the B 1 Σ + (0 + ) state. Very recently, Kauczok et al [22] have reported similar studies on the singlet and triplet Δ states that previously were identified as being in resonance with selected rovibrational states of the B 1 Σ + (0 + ) state [16][17][18].…”

“…The colour coding matches that of Figure 3. Recently, Kvaran and coworkers have detailedly studied Rydberg states of HCl with either Λ > 0 or S > 0 (i.e., belonging to the triplet manifold) or both, some of which exhibit near resonances with rovibrational levels of the B 1 Σ + state [16][17][18] Kauczok et al have recently studied the kinetic energy and the angular distributions of these fragments in order to identify those channels which become available to the HCl molecule in the near resonance situation [22]. They have found that those near-resonance rotational levels in the f 3 Δ and F 1 Δ states behave identically to the B 1 Σ + state levels.…”

“…In continuation of their work, Kvaran and coworkers [16][17][18] have investigated several of those states with a predissociation signature by a mass sensitive REMPI timeof-flight technique. Branching ratios for parent molecule ionization and fragmentation producing either H + or Cl + have been studied for both H 35 Cl and H 37 Cl isotopologues on a quantum state selective basis.…”