Hyperfine structure of theR(115) 20-1 line of127I2 at 570 nm

Abstract

The hyperfme spectrum of the iodine R(115) 20-1 line, at 570 nm, was obtained by conventional saturated absorption spectroscopy. The differences of nuclear etectric-quadrupole (he Qq) and spin-rotation (AC) constants between the B and X states were determined by a least-square fit to the experimental data. This line may provide a good frequency reference in coincidence with the 1So-IP 1 resonant transition of magnesium, at 285 nm, when this one is investigated with frequency doubled lasers.PACS 32.70.Jz -Line shapes, widths, and shifts. PACS 35.10.Fk -Fine-and hyperfine-structure constants.

Measurement of absolute photo-ionization cross sections using magnesium magneto-optical traps

“…The difference in fundamental frequency was found to be about 29 MHz. Comparing the obtained hyperfine spectrum to measured and calculated spacing presented by Cruz et al [26] we find our positions of all hyperfine components to be in excellent agreement with their results. There seems, however, to be a slight disagreement with the iodine hyperfine spectrum presented by Sengstock et al [25] concerning the position of the hyperfine u component.…”

“…There seems, however, to be a slight disagreement with the iodine hyperfine spectrum presented by Sengstock et al [25] concerning the position of the hyperfine u component. The positions of the isotopes 25 Mg and 26 Mg relative to 24 Mg are measured to be 363 and 700 MHz in fundamental frequencies corresponding to 726 and 1400 MHz in UV frequencies. These values are in good agreement with earlier works [24,25].…”

“…This corresponds to an atom velocity of about 1 m s −1 . Our setup can also trap the two other stable magnesium isotopes 25 Mg(10%) and 26 Mg(11%) independently, but signals with 24 Mg(79%) are considerably better. The absolute laser frequency of the 570.4 nm beam is referenced to a setup monitoring iodine hyperfine transitions through saturated absorption.…”

“…The absolute laser frequency of the 570.4 nm beam is referenced to a setup monitoring iodine hyperfine transitions through saturated absorption. Fortunately, the magnesium resonance frequency is almost resonant to the R(115)20 − 1 absorption manifold in the 127 I 2 molecule [24][25][26]. Furthermore, the iodine line has a hyperfine component with a frequency very close to half the frequency of the 1 S 0 → 1 P 1 transition in the 24 Mg isotope [25], thereby offering a convenient frequency reference.…”