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  • 03월 02일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제117회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Coupling of Laser with Ion Mobility Spectrometry

2016년 2월 17일 03시 15분 16초
PHYS.O-2 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 09시 : 10분
물리화학 - 일반 구두발표 (General Oral Presentation)
저자 및
최창민, Philippe Dugourd1,*
Institut Lumière Matière, Université Lyon 1-CNRS, Korea
1Institut Lumière Matière, Université Lyon 1-CNRS, France
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승인 2건
We recently developed a new experimental set-up that allows us to perform tandem ion mobility spectrometry (IMS) measurements which consists of two 79 cm long drift tubes connected by a dual ion funnel assembly. This set up allows selecting ions according to their mobility in a first drift tube before laser irradiation. The product ions can then be analyzed in terms of mobility and mass-to-charge ratio. We show some results from the combination of the laser with tandem IMS experiment. First example is reported on eosin Y, where laser irradiation was used to produce radical ions by electron photodetachment starting from doubly deprotonated species. This can be measuring the collision cross section of this photo-product, which cannot be directly produced with an electrospray source. Second, we apply a tunable picosecond laser to the tandem IMS instrument to explore the optical and structural properties of a peptide chain bound to a chromophore – a prototype system allowing for a proton transfer coupled to conformational change. We show how proton transfer between the peptide and its cofactor can dramatically modify the optical properties of the system and demonstrate that these changes can be triggered by collisional activation in the gas phase. Finally, we investigate mobility selected förster resonance energy transfer (FRET) of the chromophores grafted peptide in the gas phase. We select specific arrival time distributions using a tandem IMS and irradiate 488nm of continuous laser which excite only the donor chromophore to observe action-FRET. We obtain four different photo-fragmentation yields induced by FRET for the doubly charged cation. This spectroscopic method which combines a tandem IMS with action-FRET can be helpful to study secondary structures of biological important molecules in the gas phase.