Video Experimental Relacionado
Updated: Jun 29, 2026
09:13
Remote Magnetic Navigation for Accurate, Real-time Catheter Positioning and Ablation in Cardiac Electrophysiology Procedures
Published on: April 21, 2013
Los pulsos de rayos X se acercan a la frontera de los attosegundos.
M Drescher1, M Hentschel, R Kienberger
1Institut für Photonik, Technische Universität Wien, Gusshausstr. 27, A-1040 Wien, Austria.
Science (New York, N.Y.)
|March 10, 2001
Resumen
Los investigadores generaron pulsos de rayos X blandos únicos utilizando la generación armónica de alto orden. Estos pulsos ultracortos, que duran menos de un ciclo láser, permiten una resolución de subfemtosegundo para el estudio de la dinámica atómica.
Área de la Ciencia:
- La óptica cuántica es una óptica cuántica.
- En segundo lugar la ciencia.
- Física de rayos X en la física de rayos X.
Sus antecedentes:
- La generación armónica de alto orden (HHG) es un proceso clave para producir pulsos ultracortos de rayos ultravioleta extremos (XUV) y pulsos suaves de rayos X.
- La caracterización de pulsos ultracortos de rayos X requiere técnicas con una resolución inferior al femtosegundo para observar los fenómenos en sus escalas de tiempo naturales.
Objetivo del estudio:
- Para generar y caracterizar pulsos de rayos X suaves aislados con duraciones más cortas que el ciclo óptico del láser de conducción.
- Desarrollar técnicas para mediciones de pulsos de rayos X de resolución inferior al femtosegundo.
Principales métodos:
- Se generaron pulsos suaves de rayos X (90 eV) a través de HHG utilizando pulsos láser de 7 femtosegundos (fs) (770 nm).
- Se realizó una espectroscopia de fotoelectrones de krypton en presencia del láser conductor.
- Se detectaron fotoelectrones perpendiculares a la polarización del láser para suprimir la ampliación espectral.
- Se utilizaron mediciones de correlación cruzada para determinar la duración del pulso de rayos X.
Principales resultados:
- Se midieron pulsos suaves aislados de rayos X con una duración de 1,8 fs.
- La duración del pulso de rayos X medido es más corta que el ciclo de oscilación del láser de conducción (2,6 fs).
- Se logró una resolución de sub-ciclo láser en las mediciones de correlación cruzada.
Conclusiones:
- Las técnicas desarrolladas permiten la generación y caracterización de pulsos de rayos X por debajo de femtosegundos.
- Este avance allana el camino para la ciencia experimental.
- El estudio abre posibilidades para la observación de procesos atómicos y moleculares en escalas de tiempo de hasta un segundo.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:13The Cardiac Cycle
The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
The Process
Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and empty blood into the...
The Process
Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and empty blood into the...
01:05Pulse
The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls between...
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls between...
01:19Electrophysiology of Normal Cardiac Rhythm
The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...
01:29Electrocardiogram
An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
01:16Pulse
When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical indicator...
The pulse serves as a clinical indicator...
01:20Imaging Studies for Cardiovascular System III: X-Ray
The most common cardiovascular diagnostic test is an X-ray. It produces images of the heart, blood vessels, and adjacent structures.
Definition and Purpose
An X-ray, or radiograph, is a non-invasive method that uses ionizing radiation to take images of internal structures. It is mainly used in cardiac imaging to examine the heart, lungs, and major blood vessels, aiming to identify abnormalities in the heart's size, shape, and position, such as heart failure, congenital defects, and vascular...
Definition and Purpose
An X-ray, or radiograph, is a non-invasive method that uses ionizing radiation to take images of internal structures. It is mainly used in cardiac imaging to examine the heart, lungs, and major blood vessels, aiming to identify abnormalities in the heart's size, shape, and position, such as heart failure, congenital defects, and vascular...