نتایج جستجو برای: molecular orientation
تعداد نتایج: 731909 فیلتر نتایج به سال:
We report the first experimental observation of nonadiabatic field-free orientation of a heteronuclear diatomic molecule (CO) induced by an intense two-color (800 and 400 nm) femtosecond laser field. We monitor orientation by measuring fragment ion angular distributions after Coulomb explosion with an 800 nm pulse. The orientation of the molecules is controlled by the relative phase of the two-...
We use heterodyne-detected vibrational sum-frequency generation (HD-VSFG) to determine the orientation of the molecular plane of methylguanidinium ions at the surface of aqueous solutions. We measure the VSFG response of the symmetric and antisymmetric methyl stretch vibrations of the methylguanidinium ion with different polarization combinations. We find that for at least 50% of the methylguan...
Experiments show high-speed spinning of many synthetic bers is accompanied by the partial crys-tallization of the initially amorphous melt. This crystallization is induced by some combination of the extensional ow, molecular orientation and extension, and temperature dependence. The crystallization of the material couples back to aaect the ber rheology, through a process of stress-hardening. Re...
به دلیل عوارض غیر قابل جبران توکسوپلاسموزیس در افراد دچار نقص سیستم ایمنی و نوزادان متولد شده از مادران آلوده، نیاز مبرم به تکنیک های سریع، حساس و دقیق برای شناسایی توکسوپلاسما گوندی احساس می شود. روش های مولکولی به عنوان روش های حساس تر و اختصاصی-تر از رو ش های سرولوژیک در تشخیص توکسوپلاسموزیس مطرح هستند. در این مطالعه، استفاده از روش real-time nasba برای سنجش کمی بار انگلی در خون ر ت های آلو...
Since the discovery in the late 18th century of electrically induced mechanical response in muscle tissue, coupling between electrical and mechanical phenomena has been shown to be a near-universal feature of biological systems. Here, we employ scanning probe microscopy (SPM) to measure the sub-Angstrom mechanical response of a biological system induced by an electric bias applied to a conducti...
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