: |
: |
|---|
-) AND FeNO(X2
i) RADICALS IN THE VIBRATIONAL EXCITED STATES.
SEIKI IKEDA, MOTOKI NAKASHIMA, AI SAKAMOTO, MASATO HAYASHI, KEUSUKE HARADA AND KEIICHI TANAKA, Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki, Higashiku, Fukuoka, 812-8581 JAPAN.
Rotational spectra of the FeCO and FeNO radicals produced by UV laser photolysis in the vibrational excited states were measured in the millimeter-wave region with the conventional absorption cell at room temperature.
~~~The rotational transitions of the FeCO radical in the ground and
2 states have been observed by millimeter-wave spectroscopy, and the
1 fundamental band and hot band from
2 state also have been studied by infrared diode laser spectroscopy. In the present work, the rotational transitions (J = 33 - 32
37 - 36 ) in the
3 state of the X3
- state were observed to split into 3 components due to the spin-rotation and spin-spin interactions. Molecular constants including rotational constant and centrifugal distortion constant were determined by a least squares fitting. The equilibrium rotational constant Be was calculated to be 4373.405(72) MHz from the vibration rotation constant
3 = 20.2051(42) MHz, and previously reported
1 and
2. The bond length between Fe and C, calculated to be 1.725 Å~ assuming r CO= 1.159 Å, agrees well with the ab initio result, r FeC = 1.722 Å. The 2
2 state split into 9 substates due to the vibronic interaction, and the rotational transitions in the P = 0 component were observed.
~~~The rotational transitions of the FeNO radical in the ground and
2 states, and the
1 band have been observed in the millimeter-wave and infrared region, respectively. The rotational transitions (J = 28.5 - 27.5
32.5 - 31.5 ) in the 2
2 state of the X2
i state were observed in the present study. The 2
2 state (
= 5/2) splits into 3 substates, 2
_P = 9/2, 2
_P = 5/2 and 2
_P = 1/2, due to the vibronic interaction. The absorption lines in the 2
_P = 1/2 state split into two components because of the p-type doubling. The transition in the
3 state is now under survey to determine the constant
3 and the equilibrium rotational constant.