High resolution absorption spectra of the A 3Π1u–X 1Σ+g system of I2, consisting of some 9552 lines of some 79 bands spanning the vibrational range v′=0–35 and v″=3–17, have been recorded and analyzed. A fit to them which uses the previously determined accurate molecular constants for the X 1Σ+g state yields an accurate new set of molecular constants for the A state, including the Λ doubling constants. The A-state vibrational and inertial rotational constants, as well as mechanically consistent centrifugal distortion constants, are represented by near-dissociation expansions, yielding an accurate representation of the experimental data which also provides a reliable global representation of all observed and unobserved vibration–rotation levels of this state.
The spectrum of the titaniu m monoxide molecule has been studied by means of a sub-D oppler experiment combining an effusive beam of TiO and a cw tunable dye laser beam. In the 560 nm to 565 nm range, 260 absorption lines have been recorded through the laser-induced ¯uorescence technique of detection. Because the absorption pro® les are narrow, a sensitiv e program of data acquisition and analysis is used. These wave-numbers have been measured by reference to the absorption spectrum of the iodine molecule to an absolute uncertainty of 30 MHz (0,001 cm ±1 ). For the 140 lines of the c 1 -a 1 (0-0) band of 48 Ti 16 O which have been identi® ed, the rm s error between m easured and calculated wave-numbers is just 21 MHz (0,0007 cm ±1 ).
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