Collisional deactivation of vibrationally highly excited ethylene molecule produced from the 121.6nm photolysis of ethylbromide was studied at pressure region with presence of He, $CF_4$, $CO_2$, and $C_2H_5Br$ as collisional partners.
By observing the ratio of decomposition to stabilization(D/S) of ethylene and comparing the calculated behaviors, we have obtained the average energy removed per collision by the collision partners. In the stepladder model the measured energies were found to be(in $cm^{-1}$/mole unit): $500cm^{-1}$ for He; $6500cm^{-1}$ for $C_2H_5Br$; $1700cm^{-1}$ for $CF_4$; and $1700cm^{-1}$ for $CO_2$. In the exponential model, the transfer energy of He was $700cm^{-1}$ by collision. The pressure dependence on the collision efficiency has been investigated and the energetics has also been studied.
The RRKM calculation was used to analyze the experimental results quantitatively and the pressure dependence on product ratios was well explained by the calculation.
121.6 nm 에틸브로마이드의 광분해 반응으로부터 생성된 진동 여기된 에틸렌의 탈활성화를 He, $CF_4$, $CO_2$, 그리고 $C_2H_5Br$ 충돌짝들을 이용하여 연구하였다.
관찰한 에틸렌과 아세틸렌의 비와 계산에서 구한 값을 비교함으로써 충돌당 제거되는 평균 에너지를 구할 수 있다. 사다리꼴 모형에 대하여 각각 $500 cm^{-1}$, $1700 cm^{-1}$, $ 1700 cm^{-1}$, 그리고 $6500 cm^{-1}$ 였으며 헬륨의 경우 지수형 모델에서 $700 cm^{-1}$ 였다. 또한 충돌 효율의 압력 의존성과 에너지 분배에 대하여 연구하였다.
실험 결과를 정량적으로 해석하기 위하여 RRKM 이론을 사용하였으며 압력에 대한 생성물의 비는 이 계산에 의하여 잘 설명되었다.
