Measurements of the radiative lifetimes of TiO (A^3PHI, B^3PI, C^3DELTA, c^1PHI, f^1DELTA, E^3PI) states.

Details Measurements of the radiative lifetimes of TiO (A^3PHI, B^3PI, C^3DELTA, c^1PHI, f^1DELTA, E^3PI) states. Measurements of the radiative lifetimes of TiO (A^3PHI, B^3PI, C^3DELTA, c^1PHI, f^1DELTA, E^3PI) states.

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...304..667h&link_type=abstract

Astronomy and Astrophysics, v.304, p.667

Astronomy and Astrophysics

Astrophysics

28

Molecular Data, Methods: Laboratory, Stars: Abundances

Scientific paper

TiO molecules have been generated in X^3DELTA and a^1DELTA dark states within a collimated, pulsed, supersonic molecular beam. The rotational cooling produced in the expansion and the collision-free nature of the beam provide conditions particularly well suited to direct radiative lifetime determinations. Analysis of fluorescence decay following pulsed dye-laser excitation of the TiO molecules through the γ(A^3PHI-X^3DELTA), γ' (B^3PI-X^3DELTA), α(C^3DELTA-X^3DELTA), β(c^1PHI-a^1DELTA), (f^1DELTA-a^1DELTA) and ɛ(E^3PI-X^3DELTA) transitions has produced a set of precise lifetime measurements for five electronically excited states, A^3PHI, B^3PI, C^3DELTA, c^1PHI, f^1DELTA, the latter being previously unmeasured, and a rough lower limit for the E^3PI state. The following values have been found (errors quoted at 95% confidence interval): A^3PHI_2_ state, τ_v=0_=103.3+/-3.6ns, τ_v=1_=112.9+/-1.8ns; A^3PHI_3_ state, τ_v=0_=101.9+/-3.6ns, τ_v=1_=109.2+/-2.8ns; A^3PHI_4_ state, τ_v=0_=98.7+/-4.4ns, τ_v=1_=105.6+/-3.6ns; B^3PI_0_ state, τ_v=0_=65.6+/-1.2ns, τ_v=1_=66.5+/-1.0ns, τ_v=2_=63.8+/-1.4ns; B^3PI_1_ state, τ_v=0_=64.6+/-1.6ns, τ_v=1_=67.6+/-1.2ns, τ_v=2_=67.8+/-1.4ns; B^3PI_2_ state, τ_v=0_=66.1+/-1.2ns, τ_v=1_=69.0+/-1.2ns, τ_v=2_=68.1+/-2.0ns; C^3DELTA state, τ_v=0_=43.3+/-1.0ns, τ_v=1_=43.0+/-1.2ns; c^1PHI state, τ_v=0_=38.3+/-1.6ns, τ_v=1_=37.3+/-5.2ns; f^1DELTA state, τ_v=0_=43.2+/-2.0ns. For the E^3PI state, a value τ_v=0_>2000ns is suggested. Most of these values differ from previous determinations by more than the quoted experimental uncertainty. Recommended values for the band oscillator strengths, derived from these data, are also given.

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