Progress towards a nuclear Schiff moment measurement using 205TlF molecules in CeNTREX*

The aim of CeNTREX (Cold molecule Nuclear Time-Reversal Experiment) is to search for the time-reversal and parity-violating Schiff moment of the 205Tl nuclear. The energy shift resulting fomr the 205 Tl Schiff moment is greatly amplified in the polar thallium fluoride (TlF) molecule, relative to the case in atoms. We employ two methods to maximize population in the science state: rotational cooling to pump the lowest rotational states into a single J=0 hyperfine level of the ¹Σ⁺ electric ground state and electrostatic focusing with a quadrupole lens. Rotational cooling pumps into the J=0 state, but the electrostatic lens requires the weak field seeking states in J=2, and the science state is in J=1. This requires multiple state transfer stages, which we perform using adiabatic passage with microwaves. Finally, the Schiff moment measurement requires nulling of the magetic fields in the interaction region to within 10 μG, which is achieved witha combination of passive shielding and shim coils. This talk will discuss progress towards implementing these techniques.