STARK HOLE BURNING SPECTROSCOPY OF MODEL HEMES
HEME 模型的 STARK 孔燃烧光谱
基本信息
- 批准号:3734445
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:美国
- 项目类别:
- 财政年份:
- 资助国家:美国
- 起止时间:至
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
The research described in this proposal is a continuation of a study of
biologically important molecules in the solid state, with respect to
their electronic excited state properties, photochemistry and dynamics,
using a combination of optical hole-burning and the Stark effect. When
an absorbing molecule is dissolved in a matrix, its electronic spectrum
is inhomogeneously broadened due to variations in the local environments.
If a laser which has a bandwidth much less than the inhomogeneous band
width is used to excite these absorbers, it is possible to burn an
optical hole in the spectrum. Holes result from photochemistry,
transient storage or molecular reorientation. Since the hole widths are
often measured in MHz, when coupled with the Stark effect, this becomes
a very high resolution probe of molecular properties.
The long-term objectives of this research are to extract detailed excited
state information (e.g. dipole moments, polarizabilities, geometry) from
isolated porphyrin molecules using Stark hole-burning method and develop
and extend the techniques so that it can be used as a high resolution
probe on biological molecules in more physiologically realistic
environments. Specifically we intend to continue our study of simple
free base and metalloporphyrins in well defined n-alkane crystal
matrices. Then the study will be extended to use randomly oriented
porphyrins in glasses. Finally, we will apply Stark hole-burning to more
complex biological molecules (e.g. heme) in low temperature glasses and
solutions.
The methodology involves the growth of single mixed (porphyrin/n-alkane)
crystals and making low temperature glass solutions. The sample is
placed between electrodes and immersed in liquid N2 or He and an
absorption or emission spectrum obtained. Optical holes are burned and
scanned with a narrow band laser; the Stark field is applied either DC
or pulsed depending on the need. The subsequent electric field effects
are then related to molecular excited state properties and dynamics.
本提案中所描述的研究是一项研究的延续
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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JOHN R LOMBARDI其他文献
JOHN R LOMBARDI的其他文献
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{{ truncateString('JOHN R LOMBARDI', 18)}}的其他基金
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